The invention provides a synchronous tunnel video display system, which comprises a power supply module, a master server, a human-computer interaction module, a plurality of display modules, a plurality of synchronization modules and a communication module, wherein the master server is used for producing a play image; the plurality of display modules are arranged in a plurality of train running tunnels, and are used for displaying video image information; the plurality of synchronization modules are used for ensuring the synchronization of a train running state and information displayed by the display modules; the communication module transmits data produced by the master server to the display modules; the synchronization module further comprises a plurality of speed testers and a synchronization signal processor; the speed testers are arranged between two metro stations, and are uniformly distributed in the tunnels between the two stations of a train, and when detecting the passage of the train, transmit the information to the synchronization signal processor respectively; the synchronization signal processor performs calculation to obtain a synchronization control signal, transmits the synchronization control signal to the display modules; and the display modules display the video image information according to the instruction of the synchronization control signal. The synchronous tunnel video display system has the advantages of synchronous display capability and high definition.