In order to solve the problems of safety of blasting roof cutting in gas accumulation area and limitation of hydraulic fracture in mining fracture development area, we studied the mechanical structure of roof plate during roof cutting and uncutting along the empty retention lane, the mechanism of roof cutting by non-blasting intensive drilling and the parameter optimization of roof cutting drilling. Using the method of stress concentration around the borehole to crack the surrounding rock, the mechanism of dense drilling to cut the roof was analyzed, and the effect of dense drilling to cut the roof along the reuse lane of the 3202 inlet windway of Dongfeng coal mine was studied with the numerical simulation software 3DEC, and the parameters were optimized. The research results show that: when no drilling is done to cut the roof, the top plate of the stay lane sinks seriously; when the diameter of the drilling is 110 mm and the spacing is 150 mm, a dense drilling weakening zone can be formed; the rock layer between the drilling is broken obviously; when the drilling height is 22 m and the angle of drilling is 80° in elevation, the basic top rock layer collapses completely and the displacement of the top and bottom plate of the stay lane is reduced obviously.