The invention discloses a power system wide area message transmission method comprising the steps as follows: S1, an application program of a local scheduling mechanism calls a wide area message bus interface to transmit a message to a local message agent; S2, the local message agent forwards the message to a local wide area message agent; S3, the local wide area message agents finds a target scheduling mechanism and build a connection, and transmits the message to the wide area message agent of the target scheduling mechanism; and S4, the wide area message agent of the target scheduling mechanism forwards the message to the local message agent, and the local message agent queries the application program subscribing for the message according to subscription information, and pushes the message to the application program. According to the method provided by the invention, the efficient and universal wide area message transmission mechanism is built, and thus the requirement on the function of pushing the real-time message across the scheduling mechanisms is met.