Abstract: According to the theory of coal-oxygen complex action, the theory of spontaneous combustion danger area in goaf and the theory of mining and overburden failure, the evaluation method of threat degree for spontaneous combustion in working face under close coal seam group mining condition is established. This evaluation method takes the objective factor as the evaluation index and eliminates the influence of subjective factors. The evaluation method is simple and flexible and easy to use with short evaluation period, and can be evaluated according to the change of underground mining face at any time, and has good adaptability. After on-site practical application in Wuhai Mining Area, the evaluation results are accurate and reliable. The establishment of this evaluation method can realize the advanced warning of spontaneous combustion threat to coal mining face in close coal seam group.