Method for filtering network messages of process level of intelligent substation

Provided is a method for filtering network messages of a process level of an intelligent substation. A network of the process level of the intelligent substation is connected with various devices which comprise a merging unit, an intelligent terminal, a switchboard, a protection device and a measuring and control device, wherein the devices are used for sending and receiving SV messages and GOOSE messages, message filtering modules are additionally arranged between network interfaces and physical layers of the devices, the received messages are filtered additionally in a message filtering mode, traffic limitation is performed on the messages with MAC addresses assigned by the devices, key fields of the messages with the MAC addresses assigned by the devices are recognized, repeated messages are filtered, the messages without the MAC addresses assigned by the devices are discarded or forwarded, and broadcasting messages are discarded or forwarded. According to the method, the accurate management of the GOOSE messages and the SV messages can be achieved through the merging unit, the intelligent terminal, the switchboard, the protection device and the measuring and control device in the intelligent substation.