Abstract: Existing underground transceiver communication of wireless location system adopts radio wave, and its communication distance and quality are effected by small tunnels and rocks with complex composition. In view of the above problems, a transceiver of underground location system based on visible light color division duplex was designed. The transceiver adopts LED to transmit information and uses photodiode to receive light data, so as to realize wireless visible light communication. Color division duplex mode is used in uplink and downlink of the transceiver. The signals in two-direction are modulated in two visible light channels with different colors in order to send and receive data. The experiment results show that the transceiver has low power consumption, good anti-electromagnetic interference performance, stable reception and also can be used for lighting.