Abstract: Combined with the serious spontaneous combustion hidden trouble occurred at 2274 working face of Baijiao Coal Mine during the working face driving and passing through overburdened goaf, the paper proposes the fire disaster prevention scheme of “extinguishing fire + fire prevention” by analyzing the causes of hidden trouble, the comprehensive control technology of spontaneous combustion in goaf of overburden complex geologic structure coal seam is proposed. Taking the observation of drilling holes in the overburden fire area as the forerunner and rationally delineating the hidden danger scope; taking the method of extinguishing the liquid CO₂ in the mined-out area, injecting and plugging the roadway and injecting inerting nitrogen, the upper goaf spontaneous combustion hidden trouble is successfully processed, and safe mining face is ensured at the same time.