diff --git a/frontend/lib/registry/components/file-upload/FileManagerModal.tsx b/frontend/lib/registry/components/file-upload/FileManagerModal.tsx
index f8c76ca0..cfed8223 100644
--- a/frontend/lib/registry/components/file-upload/FileManagerModal.tsx
+++ b/frontend/lib/registry/components/file-upload/FileManagerModal.tsx
@@ -17,7 +17,8 @@ import {
   Music,
   Archive,
   Presentation,
-  X
+  X,
+  Star
 } from "lucide-react";
 import { formatFileSize } from "@/lib/utils";
 import { FileViewerModal } from "./FileViewerModal";
@@ -30,6 +31,7 @@ interface FileManagerModalProps {
   onFileDownload: (file: FileInfo) => void;
   onFileDelete: (file: FileInfo) => void;
   onFileView: (file: FileInfo) => void;
+  onSetRepresentative?: (file: FileInfo) => void; // 대표 이미지 설정 콜백
   config: FileUploadConfig;
   isDesignMode?: boolean;
 }
@@ -42,6 +44,7 @@ export const FileManagerModal: React.FC<FileManagerModalProps> = ({
   onFileDownload,
   onFileDelete,
   onFileView,
+  onSetRepresentative,
   config,
   isDesignMode = false,
 }) => {
@@ -228,14 +231,32 @@ export const FileManagerModal: React.FC<FileManagerModalProps> = ({
                           {getFileIcon(file.fileExt)}
                         </div>
                         <div className="flex-1 min-w-0">
-                          <p className="text-sm font-medium text-gray-900 truncate">
-                            {file.realFileName}
-                          </p>
+                          <div className="flex items-center gap-2">
+                            <span className="text-sm font-medium text-gray-900 truncate">
+                              {file.realFileName}
+                            </span>
+                            {file.isRepresentative && (
+                              <Badge variant="default" className="h-5 px-1.5 text-xs">
+                                대표
+                              </Badge>
+                            )}
+                          </div>
                           <p className="text-xs text-gray-500">
                             {formatFileSize(file.fileSize)} • {file.fileExt.toUpperCase()}
                           </p>
                         </div>
                         <div className="flex items-center space-x-1">
+                          {onSetRepresentative && (
+                            <Button
+                              variant={file.isRepresentative ? "default" : "ghost"}
+                              size="sm"
+                              className="h-8 w-8 p-0"
+                              onClick={() => onSetRepresentative(file)}
+                              title={file.isRepresentative ? "현재 대표 파일" : "대표 파일로 설정"}
+                            >
+                              <Star className={`w-4 h-4 ${file.isRepresentative ? "fill-white" : ""}`} />
+                            </Button>
+                          )}
                           <Button
                             variant="ghost"
                             size="sm"
diff --git a/frontend/lib/registry/components/file-upload/FileUploadComponent.tsx b/frontend/lib/registry/components/file-upload/FileUploadComponent.tsx
index 5eea6d60..b68cf529 100644
--- a/frontend/lib/registry/components/file-upload/FileUploadComponent.tsx
+++ b/frontend/lib/registry/components/file-upload/FileUploadComponent.tsx
@@ -6,6 +6,7 @@ import { toast } from "sonner";
 import { uploadFiles, downloadFile, deleteFile, getComponentFiles } from "@/lib/api/file";
 import { GlobalFileManager } from "@/lib/api/globalFile";
 import { formatFileSize } from "@/lib/utils";
+import { apiClient } from "@/lib/api/client";
 import { FileViewerModal } from "./FileViewerModal";
 import { FileManagerModal } from "./FileManagerModal";
 import { FileUploadConfig, FileInfo, FileUploadStatus, FileUploadResponse } from "./types";
@@ -98,6 +99,7 @@ const FileUploadComponent: React.FC<FileUploadComponentProps> = ({
   const [isViewerOpen, setIsViewerOpen] = useState(false);
   const [isFileManagerOpen, setIsFileManagerOpen] = useState(false);
   const [forceUpdate, setForceUpdate] = useState(0);
+  const [representativeImageUrl, setRepresentativeImageUrl] = useState<string | null>(null);
   const fileInputRef = useRef<HTMLInputElement>(null);
 
   // 컴포넌트 마운트 시 즉시 localStorage에서 파일 복원
@@ -832,6 +834,113 @@ const FileUploadComponent: React.FC<FileUploadComponentProps> = ({
     [uploadedFiles, onUpdate, component.id],
   );
 
+  // 대표 이미지 Blob URL 로드
+  const loadRepresentativeImage = useCallback(
+    async (file: FileInfo) => {
+      try {
+        const isImage = ["jpg", "jpeg", "png", "gif", "bmp", "webp", "svg"].includes(
+          file.fileExt.toLowerCase().replace(".", "")
+        );
+
+        if (!isImage) {
+          setRepresentativeImageUrl(null);
+          return;
+        }
+
+        console.log("🖼️ 대표 이미지 로드 시작:", file.realFileName);
+
+        // API 클라이언트를 통해 Blob으로 다운로드 (인증 토큰 포함)
+        const response = await apiClient.get(`/files/download/${file.objid}`, {
+          params: {
+            serverFilename: file.savedFileName,
+          },
+          responseType: "blob",
+        });
+
+        // Blob URL 생성
+        const blob = new Blob([response.data]);
+        const url = window.URL.createObjectURL(blob);
+        
+        // 이전 URL 정리
+        if (representativeImageUrl) {
+          window.URL.revokeObjectURL(representativeImageUrl);
+        }
+
+        setRepresentativeImageUrl(url);
+        console.log("✅ 대표 이미지 로드 성공:", url);
+      } catch (error) {
+        console.error("❌ 대표 이미지 로드 실패:", error);
+        setRepresentativeImageUrl(null);
+      }
+    },
+    [representativeImageUrl],
+  );
+
+  // 대표 이미지 설정 핸들러
+  const handleSetRepresentative = useCallback(
+    (file: FileInfo) => {
+      const updatedFiles = uploadedFiles.map((f) => ({
+        ...f,
+        isRepresentative: f.objid === file.objid,
+      }));
+
+      setUploadedFiles(updatedFiles);
+
+      // 대표 이미지 로드
+      loadRepresentativeImage(file);
+
+      // localStorage 백업
+      try {
+        const backupKey = `fileUpload_${component.id}`;
+        localStorage.setItem(backupKey, JSON.stringify(updatedFiles));
+        console.log("📌 대표 파일 설정 완료:", {
+          componentId: component.id,
+          representativeFile: file.realFileName,
+        });
+      } catch (e) {
+        console.warn("localStorage 저장 실패:", e);
+      }
+
+      // 전역 상태 동기화
+      if (typeof window !== "undefined") {
+        (window as any).globalFileState = {
+          ...(window as any).globalFileState,
+          [component.id]: updatedFiles,
+        };
+
+        // 실시간 동기화 이벤트 발송
+        const syncEvent = new CustomEvent("fileStateChanged", {
+          detail: {
+            componentId: component.id,
+            files: updatedFiles,
+            action: "setRepresentative",
+          },
+        });
+        window.dispatchEvent(syncEvent);
+      }
+
+      toast.success(`${file.realFileName}을(를) 대표 파일로 설정했습니다.`);
+    },
+    [uploadedFiles, component.id, loadRepresentativeImage],
+  );
+
+  // uploadedFiles 변경 시 대표 이미지 로드
+  useEffect(() => {
+    const representativeFile = uploadedFiles.find(f => f.isRepresentative) || uploadedFiles[0];
+    if (representativeFile) {
+      loadRepresentativeImage(representativeFile);
+    } else {
+      setRepresentativeImageUrl(null);
+    }
+
+    // 컴포넌트 언마운트 시 Blob URL 정리
+    return () => {
+      if (representativeImageUrl) {
+        window.URL.revokeObjectURL(representativeImageUrl);
+      }
+    };
+  }, [uploadedFiles]);
+
   // 드래그 앤 드롭 핸들러
   const handleDragOver = useCallback(
     (e: React.DragEvent) => {
@@ -913,8 +1022,8 @@ const FileUploadComponent: React.FC<FileUploadComponentProps> = ({
       }}
       className={`${className} file-upload-container`}
     >
-      {/* 라벨 렌더링 - 주석처리 */}
-      {/* {component.label && component.style?.labelDisplay !== false && (
+      {/* 라벨 렌더링 */}
+      {component.label && component.style?.labelDisplay !== false && (
         <label
           style={{
             position: "absolute",
@@ -936,148 +1045,72 @@ const FileUploadComponent: React.FC<FileUploadComponentProps> = ({
             <span style={{ color: "#ef4444" }}>*</span>
           )}
         </label>
-      )} */}
+      )}
 
       <div
-        className="border-border bg-card flex h-full w-full flex-col space-y-3 rounded-lg border p-3 transition-all duration-200 hover:shadow-sm"
+        className="border-border bg-card relative flex h-full w-full flex-col rounded-lg border overflow-hidden"
       >
-        {/* 파일 업로드 영역 - 주석처리 */}
-        {/* {!isDesignMode && (
-          <div
-            className={`
-              border border-dashed rounded p-2 text-center cursor-pointer transition-colors
-              ${dragOver ? 'border-blue-400 bg-blue-50' : 'border-gray-300'}
-              ${safeComponentConfig.disabled ? 'opacity-50 cursor-not-allowed' : 'hover:border-gray-400'}
-              ${uploadStatus === 'uploading' ? 'opacity-75' : ''}
-            `}
-            style={{ minHeight: '50px' }}
-        onClick={handleClick}
-            onDragOver={handleDragOver}
-            onDragLeave={handleDragLeave}
-            onDrop={handleDrop}
-        onDragStart={onDragStart}
-        onDragEnd={onDragEnd}
-      >
-        <input
-              ref={fileInputRef}
-          type="file"
-          multiple={safeComponentConfig.multiple}
-          accept={safeComponentConfig.accept}
-          onChange={handleInputChange}
-              className="hidden"
-              disabled={safeComponentConfig.disabled}
-            />
-            
-            {uploadStatus === 'uploading' ? (
-              <div className="flex flex-col items-center space-y-2">
-                <div className="flex items-center space-x-2">
-                  <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600"></div>
-                  <span className="text-blue-600 font-medium">업로드 중...</span>
-                </div>
-              </div>
-            ) : (
-              <>
-                <div>
-                  <Upload className="mx-auto h-6 w-6 text-gray-400 mb-2" />
-                  <p className="text-xs font-medium text-gray-600">
-                    파일 업로드
-                  </p>
-                </div>
-              </>
-            )}
-          </div>
-        )} */}
+        {/* 대표 이미지 전체 화면 표시 */}
+        {uploadedFiles.length > 0 ? (() => {
+          const representativeFile = uploadedFiles.find(f => f.isRepresentative) || uploadedFiles[0];
+          const isImage = representativeFile && ["jpg", "jpeg", "png", "gif", "bmp", "webp", "svg"].includes(
+            representativeFile.fileExt.toLowerCase().replace(".", "")
+          );
 
-        {/* 업로드된 파일 목록 - 항상 표시 */}
-        {(() => {
-          const shouldShow = true; // 항상 표시하도록 강제
-          console.log("🎯🎯🎯 파일 목록 렌더링 조건 체크:", {
-            uploadedFilesLength: uploadedFiles.length,
-            isDesignMode: isDesignMode,
-            shouldShow: shouldShow,
-            uploadedFiles: uploadedFiles.map((f) => ({ objid: f.objid, name: f.realFileName })),
-            "🚨 렌더링 여부": shouldShow ? "✅ 렌더링됨" : "❌ 렌더링 안됨",
-          });
-          return shouldShow;
-        })() && (
-          <div className="flex-1 overflow-y-auto">
-            <div className="space-y-2">
-              <div className="flex items-center justify-between">
-                <h4 className="flex items-center gap-2 text-sm font-semibold">
-                  <File className="text-primary h-4 w-4" />
-                  업로드된 파일 ({uploadedFiles.length})
-                </h4>
-                <div className="flex items-center space-x-2">
-                  {uploadedFiles.length > 0 && (
-                    <Badge variant="secondary" className="h-5 px-1.5 text-xs">
-                      총 {formatFileSize(uploadedFiles.reduce((sum, file) => sum + file.fileSize, 0))}
-                    </Badge>
-                  )}
-                  <Button
-                    variant="outline"
-                    size="sm"
-                    className="h-7 px-2 text-xs"
-                    onClick={() => setIsFileManagerOpen(true)}
-                    style={{
-                      boxShadow: "none !important",
-                      textShadow: "none !important",
-                      filter: "none !important",
-                      WebkitBoxShadow: "none !important",
-                      MozBoxShadow: "none !important",
-                    }}
-                  >
-                    자세히보기
-                  </Button>
+          return (
+            <>
+              {isImage && representativeImageUrl ? (
+                <div className="relative h-full w-full flex items-center justify-center bg-muted/10">
+                  <img
+                    src={representativeImageUrl}
+                    alt={representativeFile.realFileName}
+                    className="h-full w-full object-contain"
+                  />
                 </div>
-              </div>
-
-              {uploadedFiles.length > 0 ? (
-                <div className="space-y-1">
-                  {uploadedFiles.map((file) => (
-                    <div
-                      key={file.objid}
-                      className="hover:bg-accent flex items-center space-x-3 rounded p-2 text-sm transition-colors"
-                      style={{ boxShadow: "none", textShadow: "none" }}
-                    >
-                      <div className="flex-shrink-0">{getFileIcon(file.fileExt)}</div>
-                      <span
-                        className="flex-1 cursor-pointer truncate text-gray-900"
-                        onClick={() => handleFileView(file)}
-                        style={{ textShadow: "none" }}
-                      >
-                        {file.realFileName}
-                      </span>
-                      <span className="text-xs text-gray-500" style={{ textShadow: "none" }}>
-                        {formatFileSize(file.fileSize)}
-                      </span>
-                    </div>
-                  ))}
-                  <div className="mt-2 text-center text-xs text-gray-500" style={{ textShadow: "none" }}>
-                    💡 파일명 클릭으로 미리보기 또는 "전체 자세히보기"로 파일 관리
-                  </div>
+              ) : isImage && !representativeImageUrl ? (
+                <div className="flex h-full w-full flex-col items-center justify-center">
+                  <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary mb-2"></div>
+                  <p className="text-sm text-muted-foreground">이미지 로딩 중...</p>
                 </div>
               ) : (
-                <div
-                  className="flex flex-col items-center justify-center py-8 text-gray-500"
-                  style={{ textShadow: "none" }}
-                >
-                  <File className="mb-3 h-12 w-12 text-gray-300" />
-                  <p className="text-sm font-medium" style={{ textShadow: "none" }}>
-                    업로드된 파일이 없습니다
-                  </p>
-                  <p className="mt-1 text-xs text-gray-400" style={{ textShadow: "none" }}>
-                    상세설정에서 파일을 업로드하세요
+                <div className="flex h-full w-full flex-col items-center justify-center">
+                  {getFileIcon(representativeFile.fileExt)}
+                  <p className="mt-3 text-sm font-medium text-center px-4">
+                    {representativeFile.realFileName}
                   </p>
+                  <Badge variant="secondary" className="mt-2">
+                    대표 파일
+                  </Badge>
                 </div>
               )}
-            </div>
+              
+              {/* 우측 하단 자세히보기 버튼 */}
+              <div className="absolute bottom-3 right-3">
+                <Button
+                  variant="secondary"
+                  size="sm"
+                  className="h-8 px-3 text-xs shadow-md"
+                  onClick={() => setIsFileManagerOpen(true)}
+                >
+                  자세히보기 ({uploadedFiles.length})
+                </Button>
+              </div>
+            </>
+          );
+        })() : (
+          <div className="flex h-full w-full flex-col items-center justify-center text-muted-foreground">
+            <File className="mb-3 h-12 w-12" />
+            <p className="text-sm font-medium">업로드된 파일이 없습니다</p>
+            <Button
+              variant="outline"
+              size="sm"
+              className="mt-4 h-8 px-3 text-xs"
+              onClick={() => setIsFileManagerOpen(true)}
+            >
+              파일 업로드
+            </Button>
           </div>
         )}
-
-        {/* 도움말 텍스트 */}
-        {safeComponentConfig.helperText && (
-          <p className="mt-1 text-xs text-gray-500">{safeComponentConfig.helperText}</p>
-        )}
       </div>
 
       {/* 파일뷰어 모달 */}
@@ -1098,6 +1131,7 @@ const FileUploadComponent: React.FC<FileUploadComponentProps> = ({
         onFileDownload={handleFileDownload}
         onFileDelete={handleFileDelete}
         onFileView={handleFileView}
+        onSetRepresentative={handleSetRepresentative}
         config={safeComponentConfig}
         isDesignMode={isDesignMode}
       />
diff --git a/frontend/lib/registry/components/file-upload/types.ts b/frontend/lib/registry/components/file-upload/types.ts
index 15eceab7..109561b4 100644
--- a/frontend/lib/registry/components/file-upload/types.ts
+++ b/frontend/lib/registry/components/file-upload/types.ts
@@ -30,6 +30,9 @@ export interface FileInfo {
   type?: string; // docType과 동일
   uploadedAt?: string; // regdate와 동일
   _file?: File; // 로컬 파일 객체 (업로드 전)
+  
+  // 대표 이미지 설정
+  isRepresentative?: boolean; // 대표 이미지로 설정 여부
 }
 
 /**