Abstract: In order to study the overall wind leakage law of composite mining airspace of shallow buried thick coal seam, taking Kuangou coal mine in Baiyanghe mining area as the research object, numerical simulation, surface exploration and tracer gas test methods are used to research and develop wind leakage sealing technology for coal seam group mining mines based on the complex wind leakage situation of the composite mining airspace of the Kuangou coal mine, and to establish a comprehensive wind leakage sealing technology system for the working face. Through PFC^2d numerical simulation analysis, it is found that the three layers of mining airspace have communicated with each other to form a composite airspace, and the fissure field of the composite airspace communicates with the surface, which may lead to serious wind leakage at the working face during the mining process of the B₂ coal seam; the wind leakage law of the working face and the airspace is measured by using the SF₆ tracer gas, and the result shows that the wind leakage at the surface of the working face and between the working faces of the I010206 working face is 6.5 m³/min, and there is a risk of natural ignition of fire. There is a danger of natural fire in the mining airspace; finally, combined with the actual situation of Kuanggou Mine and the characteristics of air leakage in the working face, a comprehensive air leakage blocking technology system is formed by sealing the air leakage on the surface and grouting drill holes to seal the air leakage in the working face.