diff --git a/src/producer/Producer.php b/src/producer/Producer.php
index f617617..8365e0a 100644
--- a/src/producer/Producer.php
+++ b/src/producer/Producer.php
@@ -38,7 +38,7 @@ class Producer
                 } else {
                     $uri = $uri.'/rocketmq/producer/send';
                 }
-                yield new Request('POST', $uri, [], $this->buildMessage($item));
+                yield new Request('POST', $uri, [], json_encode($this->buildMessage($item)));
             }
         };
         //连接池