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As the network performance of train communication network is directly affected by the network topology, a bipartite graph assignment algorithm based on the traffic weight between devices is proposed to solve the assignment problem from device to switch in network topology. Firstly, according to the actual communication situation between the devices in the train communication network, the train switched Ethernet model is established, and the traffic weight between the devices is obtained; Then, the bipartite graph assignment algorithm of traffic weight is used to complete the assignment of equipment to switch, and a new switched train network topology is constructed. The network performance of the structure is analyzed by OPNET modeling and simulation. The results show that the optimized train communication network topology can greatly improve the network performance at network delay, link utilization and throughput compared with the unoptimized topology, which can provide a theoretical reference for the optimization of train communication network topology.