Abstract: Focusing on the application field of visual communication and signal transmission of Beijing subway traffic track emergency rescue, aiming at the shortcomings of traditional wired communication systems, such as short transmission distance and poor flexibility of line laying; for wireless communication systems, poor transmission capacity and adaptability between transceiver units exists in wireless ad hoc network technology, and the instability of signal sources in communication systems combining satellites and public networks. The WIFI multi-level bridging emergency multimedia communication system architecture is proposed. The WIFI multi-level bridge technology based on 5.8GHz is researched and related equipment is developed. Based on the wireless automatic network technology, it can effectively adapt to the signal transmission scenes of long distance, occlusion and vertical difference. It is proposed to use a widely used public network 4G signal to construct a communication system, which can effectively avoid the instability caused by the vehicular base station as a signal source. When the emergency rescue site does not have 4G signal coverage, combined with the network transmission guarantee function provided by WIFI multi-level bridging technology So that the overall bridging and communication system can meet all subway rescue environments and achieve the corresponding functional requirements.