Abstract: With the increase of mine mining life, many coal bin appeared spontaneous combustion phenomenon because of disrepair and residual coal, many manufacturers do not pay sufficient attention to mine coal bin spontaneous combustion, which lays hidden for safe production. By summarizing the accident process and treatment methods that main shaft of Daxing coal bin produces CO, the study analyzes the coal spontaneous combustion phenomenon of main factors. Combined with the corresponding reasons to make effective prevention and control measures, the study puts forward suggestions from daily management and technical measures two aspects.