The invention discloses a communication device for a mining CT transmission geological radar and a working method thereof. The communication device for the mining CT transmission ground penetrating radar comprises a radar trigger signal generator, a radar trigger signal receiver, a speech acquisition and playback system, an optical fiber, an optical fiber repeater and a power supply. The communication device comprises a radar trigger signal generator, a radar trigger signal receiver, a speech acquisition and playback system, an optical fiber repeater and a power supply. There are two main functions: one is the real-time transmission of the trigger signal of the mine CT transmission geological radar, the other is the real-time voice communication of the operators. The communication device and the working method thereof solve the problems of long-distance real-time transmission of the ground penetrating radar trigger signal and real-time communication of the operator when the long-span working face CT detection is carried out in the mine complex environment, and simplify the structure of the CT transmitting ground penetrating radar.