diff --git a/jituan/services/wechat_login.py b/jituan/services/wechat_login.py
index 8bf937a..0731f2d 100644
--- a/jituan/services/wechat_login.py
+++ b/jituan/services/wechat_login.py
@@ -4,7 +4,7 @@ import random
 import time
 import uuid
 
-from django.db import transaction
+from django.db import IntegrityError, transaction
 from django.utils import timezone
 from rest_framework_simplejwt.tokens import RefreshToken
 
@@ -105,6 +105,37 @@ def _collect_role_status(user):
     }
 
 
+def _find_user_by_openid_legacy(openid):
+    """兼容旧登录/扫码注册：User.OpenID 或 UserName 存的是 openid。"""
+    user = User.query.filter(OpenID=openid).first()
+    if not user:
+        user = User.objects.filter(OpenID=openid).first()
+    if not user:
+        user = User.query.filter(UserName=openid).first()
+    if not user:
+        user = User.objects.filter(UserName=openid).first()
+    return user
+
+
+def _ensure_wx_binding(resolved_club_id, openid, user, unionid=''):
+    binding = UserWxOpenid.query.filter(
+        club_id=resolved_club_id, openid=openid,
+    ).first()
+    if binding:
+        return binding
+    try:
+        return UserWxOpenid.query.create(
+            club_id=resolved_club_id,
+            openid=openid,
+            yonghuid=user.UserUID,
+            unionid=unionid or user.UnionID or '',
+        )
+    except IntegrityError:
+        return UserWxOpenid.query.filter(
+            club_id=resolved_club_id, openid=openid,
+        ).first()
+
+
 def login_or_register_by_club(code, club_id=None, app_id=None, client_ip=''):
     """
     俱乐部微信登录核心逻辑。
@@ -132,17 +163,10 @@ def login_or_register_by_club(code, club_id=None, app_id=None, client_ip=''):
             if not user:
                 user = User.objects.filter(UserUID=binding.yonghuid).first()
 
-        if not user and resolved_club_id == CLUB_ID_DEFAULT:
-            user = User.query.filter(OpenID=openid).first()
-            if not user:
-                user = User.objects.filter(OpenID=openid).first()
+        if not user:
+            user = _find_user_by_openid_legacy(openid)
             if user:
-                UserWxOpenid.query.create(
-                    club_id=resolved_club_id,
-                    openid=openid,
-                    yonghuid=user.UserUID,
-                    unionid=unionid or user.UnionID,
-                )
+                _ensure_wx_binding(resolved_club_id, openid, user, unionid)
 
         if not user:
             user_uuid = uuid.uuid4().bytes
@@ -154,16 +178,18 @@ def login_or_register_by_club(code, club_id=None, app_id=None, client_ip=''):
                 OpenID=openid if resolved_club_id == CLUB_ID_DEFAULT else None,
                 UnionID=unionid or None,
             )
-            user.save()
-            created = True
-            _ensure_boss_profile(user)
-            _ensure_consumer_role(user)
-            UserWxOpenid.query.create(
-                club_id=resolved_club_id,
-                openid=openid,
-                yonghuid=user.UserUID,
-                unionid=unionid,
-            )
+            try:
+                user.save()
+            except IntegrityError:
+                user = _find_user_by_openid_legacy(openid)
+                if not user:
+                    raise
+                _ensure_wx_binding(resolved_club_id, openid, user, unionid)
+            else:
+                created = True
+                _ensure_boss_profile(user)
+                _ensure_consumer_role(user)
+                _ensure_wx_binding(resolved_club_id, openid, user, unionid)
 
         if unionid and unionid != (user.UnionID or ''):
             user.UnionID = unionid