Abstract: The design and implementation of on-board wireless communication terminal for rail transit in this paper was composed of multiple wireless modules, which could provide a variety of modes of wireless communication channels and wireless communication services, including 5G / 4G / 3G wireless communication services, WLAN local area network wireless connection services, AP (Access Point) hot spot wireless access services, etc.The wireless communication mode involved had adaptive control strategy and manual configuration control strategy, which could meet the requirements of rail transit operation and adapted to the actual operating environment to the greatest extent.The device has constructed an important platform support for the implementation of rail transit vehicle ground stable data interaction, maintenance equipment wireless access, bus communication medium management, and so on.