The invention discloses a method and device for carrying out transparent transmission on a message received by stateless service through long connection under microservice architecture. The method comprises the steps that a transparent transmission server receives the message and then judges whether the message is a first message of communication of this time or not according to protocol content;if the message is the first message, the transparent transmission server establishes the long connection with a target server and caches a connection handle to the memory of the current transparent transmission server; address information of the current transparent transmission server is cached to a cache server; and the transparent transmission server sends message data to the target server through the long connection, so the target server replies the message to a terminal. The transparent transmission service is independent; when the long connection is established for the first time, the address information of the current transparent transmission server is cached to the external server; and when an application server prepares for the transparent transmission, the corresponding transparent transmission server address can be found according to the cache server, the handle is found in the transparent transmission server, and the transparent transmission is carried out on the message.