This paper presents a train network control technology based on FPGA, which mainly includes a train network transmission device and the accompanying communication method. The transmission device is constructed based on FPGA units and is divided into several modules. The central control module controls the operation of the FPGA unit through logical language. The data acquisition module collects and transmits different types of data according to the central control module. The data storage space module stores the data collected by the data acquisition module and performs data storage and extraction according to the central control module. The accompanying communication method mainly includes the PCIE communication protocol module. The central control module communication protocol module is connected with the PCIE communication protocol module and transmits data based on the control instructions set by the central control module. This control technology solves the problem of low communication speed between different train network devices due to the use of various different communication protocols (such as SPI, MVB, etc.) for key data transmission. It unifies the data communication rate, reduces node failures, and at the same time, combines PCIE with redundancy technology to improve the reliability of the train network.