The invention discloses a converged message bus capable of being deployed across hosts, a message center and message clients are star-shaped architectures, and each message client uses a message protocol suitable for a deployment environment of the message client; an IPC or UPD message protocol is selected to be used in the host, so that the high efficiency of in-machine interaction is guaranteed;and the MQTT or TCP message protocol is selected to be used during cross-host interaction, so that the reliability of cross-host interaction is guaranteed. The message bus designed by the invention can be distributed across hosts, and the exchange process with end equipment can be simplified. According to the message bus designed by the invention, the protocol type can be selected according to the APP deployment environment, and both the efficiency and the reliability are considered.