Disclosed is a cross-network segment message forwarding method for a dispatching automation system,characterized in that: message forwarding servers of a transmitting end system and a receiving end system both adopt a dual-computer redundancy configuration, and the two computers are operated in a mode of a master computer and a slave computer; a wide area dual-network redundancy configuration is adopted between the transmitting end system and the receiving end system, and each of the message forwarding servers is connected to a wide area dual-network; and when the transmitting end system performs one-way message forwarding to the receiving end system, the receiving end system does not transmit a feedback packet to the transmitting end system. The method satisfies the high-performance and high-reliability real-time requirements for message forwarding of a dispatching automation system between different network segments, and further ensures the uniqueness of a message.