Train serial-parallel communication protocol to TSN network system and method

The invention relates to a system and a method for converting a serial-parallel communication protocol into a TSN network for a train. The system comprises the TSN network, a train subsystem and a TSN switching device, the switching device is used for connecting a TSN network and a train subsystem, converting subsystem data into Ethernet data frames and accessing the Ethernet data frames to the TSN network, and comprises an SOC chip and a PHY chip; the SOC chip is respectively connected with the PHY chip and the subsystem through corresponding interfaces, and is used for reading and rewriting subsystem data, packaging the subsystem data into Ethernet data frames, and sending the Ethernet data frames to a TSN network through the PHY chip after time synchronization. The TSN switching device can be compatible with three communication protocols at the same time, the problem that the communication protocols adopted by all subsystems of a train are not uniform is solved, forwarding of intermediate equipment and del