Abstract: To address the issue of altering the "three zones" of spontaneous combustion in the goaf by sealing the end of the working face, this study took the 2102 fully-mechanized caving face in Yingpanhao Coal Mine as the research object and analyzed the impact of the end sealing technology on the spontaneous combustion hazardous areas in the goaf through numerical simulation. A three-dimensional model of the goaf was constructed based on Fluent software to simulate the oxygen concentration distribution characteristics under different isolation wall spacings. The results show that reducing the isolation wall spacing significantly lowers the oxygen concentration in the goaf. Specifically, at a 20 m spacing, the oxidation zone range on the intake side is reduced from 50 to 75 m without sealing to 17 to 30 m, and on the return side from 20 to 45 m to 3 to 18 m, effectively shrinking the spontaneous combustion hazardous area. The sealing technology comprehensively suppresses the coal spontaneous combustion reaction by restricting air leakage, reducing oxygen concentration, and providing insulation, thereby enhancing mine safety. The research findings provide a theoretical basis and technical reference for the prevention and control of spontaneous combustion in the goaf of the 2102 fully-mechanized caving face in Yingpanhao Coal Mine.