diff --git a/daxpay-channel/daxpay-channel-alipay/src/main/java/cn/daxpay/open/channel/alipay/controller/isv/AlipayIsvChannelMerchantController.java b/daxpay-channel/daxpay-channel-alipay/src/main/java/cn/daxpay/open/channel/alipay/controller/isv/AlipayIsvChannelMerchantController.java
index 284ac29f7..fcca694c4 100644
--- a/daxpay-channel/daxpay-channel-alipay/src/main/java/cn/daxpay/open/channel/alipay/controller/isv/AlipayIsvChannelMerchantController.java
+++ b/daxpay-channel/daxpay-channel-alipay/src/main/java/cn/daxpay/open/channel/alipay/controller/isv/AlipayIsvChannelMerchantController.java
@@ -3,6 +3,7 @@ package cn.daxpay.open.channel.alipay.controller.isv;
 import cn.daxpay.open.platform.core.annotation.PermCode;
 import cn.daxpay.open.platform.core.rest.Res;
 import cn.daxpay.open.platform.core.rest.result.Result;
+import cn.daxpay.open.channel.alipay.param.isv.AlipayIsvAppAuthTokenUpdateParam;
 import cn.daxpay.open.channel.alipay.param.isv.AlipayIsvChannelMerchantCreateParam;
 import cn.daxpay.open.channel.alipay.result.isv.AlipayIsvChannelMerchantResult;
 import cn.daxpay.open.channel.alipay.service.isv.AlipayIsvChannelMerchantService;
@@ -44,4 +45,12 @@ public class AlipayIsvChannelMerchantController {
         alipayIsvChannelMerchantService.create(param);
         return Res.ok();
     }
+
+    @PermCode(code = "manage", nameCn = "通道商户管理", nameEn = "Channel Merchant Manage")
+    @Operation(summary = "更新应用授权令牌")
+    @PostMapping("/update-app-auth-token")
+    public Result<Void> updateAppAuthToken(@RequestBody @Validated AlipayIsvAppAuthTokenUpdateParam param) {
+        alipayIsvChannelMerchantService.updateAppAuthToken(param);
+        return Res.ok();
+    }
 }
diff --git a/daxpay-channel/daxpay-channel-alipay/src/main/java/cn/daxpay/open/channel/alipay/param/isv/AlipayIsvAppAuthTokenUpdateParam.java b/daxpay-channel/daxpay-channel-alipay/src/main/java/cn/daxpay/open/channel/alipay/param/isv/AlipayIsvAppAuthTokenUpdateParam.java
new file mode 100644
index 000000000..8fb8f2a1c
--- /dev/null
+++ b/daxpay-channel/daxpay-channel-alipay/src/main/java/cn/daxpay/open/channel/alipay/param/isv/AlipayIsvAppAuthTokenUpdateParam.java
@@ -0,0 +1,27 @@
+package cn.daxpay.open.channel.alipay.param.isv;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.NotBlank;
+import lombok.Data;
+import lombok.experimental.Accessors;
+
+/// # 应用授权令牌更新参数
+///
+/// 用于手动设置或更新支付宝服务商通道商户的应用授权令牌(app_auth_token)。
+/// 适用于创建时未填写令牌后续补充, 或令牌过期/变更后重新绑定的场景。
+///
+@Data
+@Accessors(chain = true)
+@Schema(title = "应用授权令牌更新参数")
+public class AlipayIsvAppAuthTokenUpdateParam {
+
+    /// 通道商户号
+    @Schema(description = "通道商户号")
+    @NotBlank(message = "{validation.field.channelMchNo.notBlank}")
+    private String channelMchNo;
+
+    /// 应用授权令牌(服务商代子商户调用接口的凭据)
+    @Schema(description = "应用授权令牌")
+    @NotBlank(message = "{validation.field.appAuthToken.notBlank}")
+    private String appAuthToken;
+}
diff --git a/daxpay-channel/daxpay-channel-alipay/src/main/java/cn/daxpay/open/channel/alipay/service/isv/AlipayIsvChannelMerchantService.java b/daxpay-channel/daxpay-channel-alipay/src/main/java/cn/daxpay/open/channel/alipay/service/isv/AlipayIsvChannelMerchantService.java
index be5d39b47..e002444e8 100644
--- a/daxpay-channel/daxpay-channel-alipay/src/main/java/cn/daxpay/open/channel/alipay/service/isv/AlipayIsvChannelMerchantService.java
+++ b/daxpay-channel/daxpay-channel-alipay/src/main/java/cn/daxpay/open/channel/alipay/service/isv/AlipayIsvChannelMerchantService.java
@@ -4,6 +4,7 @@ import cn.daxpay.open.channel.alipay.dao.isv.AlipayIsvAppManager;
 import cn.daxpay.open.channel.alipay.dao.isv.AlipayIsvChannelMerchantManager;
 import cn.daxpay.open.channel.alipay.entity.isv.AlipayIsvApp;
 import cn.daxpay.open.channel.alipay.entity.isv.AlipayIsvChannelMerchant;
+import cn.daxpay.open.channel.alipay.param.isv.AlipayIsvAppAuthTokenUpdateParam;
 import cn.daxpay.open.channel.alipay.param.isv.AlipayIsvChannelMerchantCreateParam;
 import cn.daxpay.open.channel.alipay.result.isv.AlipayIsvChannelMerchantResult;
 import cn.daxpay.open.payment.channel.dao.mch.ChannelMerchantManager;
@@ -75,4 +76,19 @@ public class AlipayIsvChannelMerchantService {
                 // 支付宝: 通道商户配置不存在
                 .orElseThrow(() -> new DataNotExistException("error.payment.channel.channelMerchantNotExist"));
     }
+
+    /// 更新应用授权令牌
+    ///
+    /// 手动设置或更新子商户的 app_auth_token, 适用于创建时未填写后续补充,
+    /// 或令牌过期/变更后重新绑定的场景。
+    @Transactional(rollbackFor = Exception.class)
+    public void updateAppAuthToken(AlipayIsvAppAuthTokenUpdateParam param) {
+        var entity = alipayIsvChannelMerchantManager.lambdaQuery()
+                .eq(AlipayIsvChannelMerchant::getChannelMchNo, param.getChannelMchNo())
+                .oneOpt()
+                // 支付宝: 通道商户配置不存在
+                .orElseThrow(() -> new DataNotExistException("error.payment.channel.channelMerchantNotExist"));
+        entity.setAppAuthToken(param.getAppAuthToken());
+        alipayIsvChannelMerchantManager.updateById(entity);
+    }
 }