diff --git a/shop/views/shop_base_views.py b/shop/views/shop_base_views.py
index 8d458f3..ad3acd8 100644
--- a/shop/views/shop_base_views.py
+++ b/shop/views/shop_base_views.py
@@ -499,6 +499,14 @@ class QrcodeDownloadView(APIView):
         if not image_data:
             return Response({'code': 404, 'msg': '二维码文件不存在'}, status=404)
 
+        # 店铺二维码正常仅数十 KB，超过 2MB 视为 OSS 路径异常
+        if len(image_data) > 2 * 1024 * 1024:
+            logger.error(
+                '店铺二维码文件体积异常 dianpu=%s key=%s size=%s',
+                dianpu.id, oss_key, len(image_data),
+            )
+            return Response({'code': 500, 'msg': '二维码文件异常，请重新生成'}, status=500)
+
         # 4. 返回图片（inline 供页面展示，attachment 供下载）
         filename = f"shop_qrcode_{dianpu.id}.png"
         disposition_type = 'inline' if request.GET.get('disposition') == 'inline' else 'attachment'