diff --git a/backend-node/src/services/menuCopyService.ts b/backend-node/src/services/menuCopyService.ts
index 075a8229..a163f30c 100644
--- a/backend-node/src/services/menuCopyService.ts
+++ b/backend-node/src/services/menuCopyService.ts
@@ -2201,15 +2201,20 @@ export class MenuCopyService {
         "system",
       ]);
 
-      await client.query(
+      const result = await client.query(
         `INSERT INTO screen_menu_assignments (
             screen_id, menu_objid, company_code, display_order, is_active, created_by
-        ) VALUES ${assignmentValues}`,
+        ) VALUES ${assignmentValues}
+        ON CONFLICT (screen_id, menu_objid, company_code) DO NOTHING`,
         assignmentParams
       );
-    }
 
-    logger.info(`✅ 화면-메뉴 할당 완료: ${validAssignments.length}개`);
+      logger.info(
+        `✅ 화면-메뉴 할당 완료: ${result.rowCount}개 삽입 (${validAssignments.length - (result.rowCount || 0)}개 중복 무시)`
+      );
+    } else {
+      logger.info(`📭 화면-메뉴 할당할 항목 없음`);
+    }
   }
 
   /**