diff --git a/app/main/api/internal/logic/admin_order/adminrefundorderlogic.go b/app/main/api/internal/logic/admin_order/adminrefundorderlogic.go
index 26953de..e8a1c69 100644
--- a/app/main/api/internal/logic/admin_order/adminrefundorderlogic.go
+++ b/app/main/api/internal/logic/admin_order/adminrefundorderlogic.go
@@ -81,13 +81,12 @@ func (l *AdminRefundOrderLogic) handleAlipayRefund(order *model.Order, req *type
 	if order.PayTime.Valid {
 		orderPayTime = &order.PayTime.Time
 	}
-	refundResp, err := l.svcCtx.AlipayService.AliRefund(l.ctx, order.OrderNo, req.RefundAmount, orderPayTime)
+	refundNo := l.generateRefundNo(order.OrderNo)
+	refundResp, err := l.svcCtx.AlipayService.AliRefund(l.ctx, order.OrderNo, req.RefundAmount, orderPayTime, refundNo)
 	if err != nil {
 		return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "AdminRefundOrder, 支付宝退款失败 err: %v", err)
 	}
 
-	refundNo := l.generateRefundNo(order.OrderNo)
-
 	if refundResp.IsSuccess() {
 		// 支付宝退款成功，创建成功记录
 		err = l.createRefundRecordAndUpdateOrder(order, req, refundNo, refundResp.TradeNo, model.OrderStatusRefunded, model.OrderRefundStatusSuccess)
@@ -188,9 +187,9 @@ func (l *AdminRefundOrderLogic) createRefundRecordOnly(order *model.Order, req *
 	return nil
 }
 
-// generateRefundNo 生成退款单号
+// generateRefundNo 生成退款单号（同一订单多次退款需唯一，避免 unique_refund_no 冲突）
 func (l *AdminRefundOrderLogic) generateRefundNo(orderNo string) string {
-	return fmt.Sprintf("%s%s", RefundNoPrefix, orderNo)
+	return fmt.Sprintf("%s%s-%d", RefundNoPrefix, orderNo, time.Now().UnixMilli())
 }
 
 // createNullString 创建 sql.NullString
diff --git a/app/main/api/internal/logic/pay/alipaycallbacklogic.go b/app/main/api/internal/logic/pay/alipaycallbacklogic.go
index b504641..bf71d45 100644
--- a/app/main/api/internal/logic/pay/alipaycallbacklogic.go
+++ b/app/main/api/internal/logic/pay/alipaycallbacklogic.go
@@ -220,7 +220,7 @@ func (l *AlipayCallbackLogic) handleRefund(order *model.AgentMembershipRechargeO
 	} else {
 		// 代理会员订单以创建时间为准，仅 [2026-01-25 16:38:17, 2026-02-02 18:26) 区间内订单走 bak 商户号
 		orderPayTime := order.CreateTime
-		refund, refundErr := l.svcCtx.AlipayService.AliRefund(ctx, order.OrderNo, order.Amount, &orderPayTime)
+		refund, refundErr := l.svcCtx.AlipayService.AliRefund(ctx, order.OrderNo, order.Amount, &orderPayTime, "")
 		if refundErr != nil {
 			return refundErr
 		}
diff --git a/app/main/api/internal/logic/pay/wechatpaycallbacklogic.go b/app/main/api/internal/logic/pay/wechatpaycallbacklogic.go
index 85b11f5..2f0649d 100644
--- a/app/main/api/internal/logic/pay/wechatpaycallbacklogic.go
+++ b/app/main/api/internal/logic/pay/wechatpaycallbacklogic.go
@@ -223,7 +223,7 @@ func (l *WechatPayCallbackLogic) handleRefund(order *model.AgentMembershipRechar
 	} else {
 		// 代理会员订单以创建时间为准，仅 [2026-01-25 16:38:17, 2026-02-02 18:26) 区间内订单走 bak 商户号
 		orderPayTime := order.CreateTime
-		refund, refundErr := l.svcCtx.AlipayService.AliRefund(ctx, order.OrderNo, order.Amount, &orderPayTime)
+		refund, refundErr := l.svcCtx.AlipayService.AliRefund(ctx, order.OrderNo, order.Amount, &orderPayTime, "")
 		if refundErr != nil {
 			return refundErr
 		}
diff --git a/app/main/api/internal/queue/paySuccessNotify.go b/app/main/api/internal/queue/paySuccessNotify.go
index bbeddaf..222dc0c 100644
--- a/app/main/api/internal/queue/paySuccessNotify.go
+++ b/app/main/api/internal/queue/paySuccessNotify.go
@@ -271,7 +271,7 @@ func (l *PaySuccessNotifyUserHandler) handleError(ctx context.Context, err error
 			if order.PayTime.Valid {
 				orderPayTime = &order.PayTime.Time
 			}
-			refund, refundErr := l.svcCtx.AlipayService.AliRefund(ctx, order.OrderNo, order.Amount, orderPayTime)
+			refund, refundErr := l.svcCtx.AlipayService.AliRefund(ctx, order.OrderNo, order.Amount, orderPayTime, "")
 			if refundErr != nil {
 				logx.Error(refundErr)
 				return asynq.SkipRetry
diff --git a/app/main/api/internal/service/alipayService.go b/app/main/api/internal/service/alipayService.go
index b201920..e00b71b 100644
--- a/app/main/api/internal/service/alipayService.go
+++ b/app/main/api/internal/service/alipayService.go
@@ -144,17 +144,21 @@ func (a *AliPayService) CreateAlipayOrder(ctx context.Context, amount float64, s
 }
 
 // AliRefund 发起支付宝退款。orderPayTime 为订单支付时间（或创建时间）；仅当落在 [2026-01-25 16:38:17, 2026-02-02 18:26) 区间内时使用 bak 商户号，否则使用正式商户号；传 nil 则使用正式商户号。
-func (a *AliPayService) AliRefund(ctx context.Context, outTradeNo string, refundAmount float64, orderPayTime *time.Time) (*alipay.TradeRefundRsp, error) {
+// outRequestNo 为商户退款请求号，同一笔退款需唯一；传空则使用 "refund-"+outTradeNo，重试时建议传入唯一号避免支付宝报重复。
+func (a *AliPayService) AliRefund(ctx context.Context, outTradeNo string, refundAmount float64, orderPayTime *time.Time, outRequestNo string) (*alipay.TradeRefundRsp, error) {
 	client := a.AlipayClient
 	if orderPayTime != nil && a.AlipayClientBak != nil &&
 		!orderPayTime.Before(AlipayBakRefundStart) && orderPayTime.Before(AlipayBakRefundEnd) {
 		client = a.AlipayClientBak
 	}
 
+	if outRequestNo == "" {
+		outRequestNo = fmt.Sprintf("refund-%s", outTradeNo)
+	}
 	refund := alipay.TradeRefund{
 		OutTradeNo:   outTradeNo,
 		RefundAmount: lzUtils.ToAlipayAmount(refundAmount),
-		OutRequestNo: fmt.Sprintf("refund-%s", outTradeNo),
+		OutRequestNo: outRequestNo,
 	}
 
 	refundResp, err := client.TradeRefund(ctx, refund)