In view of the problem of exposing the hard rock layer of fault during mining of No.1220 fully mechanized mining face in Shuguang Mine, the design and application of the hard rock treatment technology of the working face were carried out by means of field investigation, simulation calculation and theoretical analysis. The comprehensive analysis showed that it was feasible and economical to use hydraulic fracturing technology to weaken hard rock. The numerical simulation showed that the minimum principal stress in the coal rock mass in the range of 0~5m in front of the working face was small, which was suitable for hydraulic fracturing. The hydraulic fracturing treatment scheme was designed according to the actual conditions of No. 1220 working face. The practice showed that the hydraulic fracturing measures effectively reduced the integrity of the hard rock, improved the cuttability of the rock mass, ensured the safe and smooth progress of the working face, and achieved ideal application results. It had important reference significance.