The invention discloses a video transmission method for a subway train LCD screen and belongs to the field of embedded computers. The method comprises three modules, namely, a video server module, a switching network module and a video client module. The video server module is responsible for video signal acquisition, encoding output and error data retransmission, and performing congestion control according to the current network status information. A switching network module is responsible for packet forwarding of data, real-time statistics on port traffic and packet loss number, and feedback of current network status information to a video server. The video client module is responsible for decoding play and packet loss detection, and deciding whether to request the video server to retransmit lost data according to the network topology. The method can improve the display effect when the LCD screen plays media video information and improve the sensory quality of passengers.