The invention provides an auxiliary system for a blind crossing road based on a wireless body area network. The auxiliary system comprises a signal light state information collecting device, a centralprocessing unit, an electronic tag reader, a wireless communication module, and a wearable wireless body area network device. The signal light state information collecting device collects the state information of the signal light, and sends the collected data to the central processing unit. The electronic tag reader interacts with the wearable wireless body area network device through the wireless communication module, and sends the status information of the signal light to the wearable wireless body area network device, and the wearable wireless body area network device converts the status information of the signal light into an audio format to be played to the blind. According to the auxiliary system for the blind crossing the road based on the wireless body area network, the blind cantimely acquire the state information of the signal light, and the safety of the blind crossing the traffic crossing is increased.