diff --git a/jituan/management/commands/diagnose_lsx_invite.py b/jituan/management/commands/diagnose_lsx_invite.py
new file mode 100644
index 0000000..5179114
--- /dev/null
+++ b/jituan/management/commands/diagnose_lsx_invite.py
@@ -0,0 +1,127 @@
+"""诊断 / 对齐龙先生邀请种子与小程序 club_id。
+
+用法：
+  python manage.py diagnose_lsx_invite
+  python manage.py diagnose_lsx_invite --align-to lsx
+  python manage.py diagnose_lsx_invite --align-to-appid
+"""
+from django.core.management.base import BaseCommand, CommandError
+from django.db import transaction
+
+from jituan.models import Club
+from users.business_models import User
+from users.models import UserGuanshi, UserZuzhang
+
+LSX_APPID = 'wx7ff90e9d024fcdb8'
+SEED_UIDS = ('9910001', '9910002')
+FRONTEND_EXPECT = 'lsx'
+
+
+class Command(BaseCommand):
+    help = '诊断龙先生种子邀请人 ClubID 与小程序是否一致，并可对齐'
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            '--align-to',
+            type=str,
+            default='',
+            help='把种子用户 ClubID 改成指定值（如 lsx）',
+        )
+        parser.add_argument(
+            '--align-to-appid',
+            action='store_true',
+            help='按 wx_appid=龙先生 找到俱乐部，把种子 ClubID 对齐过去',
+        )
+
+    def handle(self, *args, **options):
+        self.stdout.write(self.style.SUCCESS('=' * 60))
+        self.stdout.write('前端龙先生小程序默认 X-Club-Id / CLUB_ID = lsx')
+        self.stdout.write(f'龙先生 AppID = {LSX_APPID}')
+        self.stdout.write('')
+
+        clubs = list(Club.query.order_by('club_id'))
+        self.stdout.write(f'库里俱乐部 {len(clubs)} 个：')
+        target_by_app = None
+        for c in clubs:
+            mark = ''
+            if c.club_id == FRONTEND_EXPECT:
+                mark = ' ← 前端期望'
+            if (c.wx_appid or '') == LSX_APPID:
+                mark += ' ← AppID命中'
+                target_by_app = c
+            if '龙先生' in (c.name or ''):
+                mark += ' ← 名称命中'
+            self.stdout.write(
+                f'  club_id={c.club_id!r} name={c.name!r} wx_appid={c.wx_appid or "(空)"}{mark}'
+            )
+
+        self.stdout.write('')
+        self.stdout.write('种子用户：')
+        for uid in SEED_UIDS:
+            user = User.query.filter(UserUID=uid).first()
+            if not user:
+                self.stdout.write(self.style.WARNING(f'  {uid}: 不存在（还没跑 seed_lsx_invite_data？）'))
+                continue
+            role = []
+            try:
+                z = user.ZuzhangProfile
+                role.append(f'组长码={z.yaoqingma}')
+            except Exception:
+                pass
+            try:
+                g = user.GuanshiProfile
+                role.append(f'管事码={g.yaoqingma}')
+            except Exception:
+                pass
+            club = (user.ClubID or '').strip()
+            ok = club == FRONTEND_EXPECT
+            line = f'  {uid}: ClubID={club or "(空)"}  {" | ".join(role) or "无身份"}'
+            if ok:
+                self.stdout.write(self.style.SUCCESS(line + '  ✓ 与前端 lsx 一致'))
+            else:
+                self.stdout.write(self.style.ERROR(
+                    line + f'  ✗ 与前端 lsx 不一致 → 会报「邀请码不属于当前小程序俱乐部」'
+                ))
+
+        self.stdout.write('')
+        self.stdout.write(self.style.WARNING(
+            '结论：这是后端校验（invite_guard），不是前端邀请码输错。\n'
+            '小程序发 X-Club-Id=lsx，邀请人 User.ClubID 必须也是 lsx。'
+        ))
+
+        align_to = (options.get('align_to') or '').strip()
+        if options.get('align_to_appid'):
+            if not target_by_app:
+                raise CommandError(f'没有 wx_appid={LSX_APPID} 的俱乐部，无法对齐')
+            align_to = target_by_app.club_id
+            self.stdout.write(f'将按 AppID 对齐到 club_id={align_to!r}')
+
+        if not align_to:
+            self.stdout.write('')
+            self.stdout.write('若要修复，任选其一：')
+            self.stdout.write('  python manage.py diagnose_lsx_invite --align-to lsx')
+            self.stdout.write('  python manage.py diagnose_lsx_invite --align-to-appid')
+            self.stdout.write('然后前端 CLUB_ID 必须与种子 ClubID 相同。')
+            self.stdout.write(self.style.SUCCESS('=' * 60))
+            return
+
+        if not Club.query.filter(club_id=align_to).exists():
+            raise CommandError(f'目标俱乐部 {align_to!r} 不存在，请先在后台创建')
+
+        with transaction.atomic():
+            for uid in SEED_UIDS:
+                user = User.query.filter(UserUID=uid).first()
+                if not user:
+                    self.stdout.write(self.style.WARNING(f'跳过不存在用户 {uid}'))
+                    continue
+                old = user.ClubID
+                user.ClubID = align_to
+                user.save(update_fields=['ClubID'])
+                self.stdout.write(self.style.SUCCESS(
+                    f'已更新 {uid}: ClubID {old!r} → {align_to!r}'
+                ))
+
+        self.stdout.write(self.style.SUCCESS(
+            f'\n对齐完成。请确认小程序 config/club-config.js 的 CLUB_ID = {align_to!r}'
+        ))
+        self.stdout.write(self.style.SUCCESS('=' * 60))
diff --git a/jituan/services/invite_guard.py b/jituan/services/invite_guard.py
index 8e53b11..13bbae2 100644
--- a/jituan/services/invite_guard.py
+++ b/jituan/services/invite_guard.py
@@ -31,7 +31,11 @@ def assert_invite_same_club(request, inviter_user, invitee_user=None):
             'invite_guard 管事俱乐部不符 inviter=%s inviter_club=%s req_club=%s',
             getattr(inviter_user, 'UserUID', '?'), inviter_club, club_id,
         )
-        return False, '邀请码不属于当前小程序俱乐部'
+        # 文案带上两侧 club，方便排查「种子 ClubID ≠ 小程序 X-Club-Id」
+        return False, (
+            f'邀请码不属于当前小程序俱乐部'
+            f'（邀请人归属={inviter_club or "空"}，当前小程序={club_id or "空"}）'
+        )
 
     if invitee_user is not None:
         invitee_club = resolve_invite_party_club(invitee_user, club_id)