Abstract: Mine exogenous fire monitoring methods were analyzed, and a mine exogenous fire identification method based on visible light and infrared image was proposed. ① Mine exogenous fire monitoring methods based on sensors for temperature, smoke and others need to arrange multiple points, so cost is high, and maintenance workload is large. ② Mine exogenous fire monitoring method based on visible light image has advantages of large monitoring range, simple use, low cost, small influence by distance, high resolution ratio, rich color information, clear edge texture information, easy extraction of flame structure information, etc. But it is influenced greatly by cap-lamp lights, roadway lights and red objects. ③ Mine exogenous fire monitoring method based on infrared image has advantages of large monitoring range and simple use, and can monitor fire in case of low visibility with smoke or others. But monitoring distance, mine dust, ambient temperature or humidity and emissivity of object surface all affect temperature measurement. Close-range workers, incandescent lamps and electromechanical equipment will affect fire monitoring. ④ The mine exogenous fire identification method based on visible light and infrared image improves accuracy of fire identification. When both visible light image and infrared image identify fire, it is determined to be a fire, and a fire alarm signal is issued. When there is only a single visible light image or infrared image to identify fire, it is not determined to be a fire, and a suspected fire alarm signal is issued. ⑤ The feasibility of the mine exogenous fire identification method based on visible light and infrared image is verified by experiments.