Method for reducing reserved width of mining stopping line coal pillar of working face with extra-large mining height

The invention discloses a method for reducing the reserved width of a mining stopping line coal pillar of an extra-large mining height working face, which comprises the following steps of: judging an overlying key layer of a coal seam according to a rock stratum index; determining one or more underground fracturing target layers and one or more ground fracturing target layers from the pre-determined key layers; the underground fracturing target layer is arranged before the working face advances to the mining stopping line position, and the underground fracturing target layer is fractured; the ground fracturing target layer is arranged after the working face advances to the mining stopping line position, and the ground fracturing target layer is fractured; and calculating a mining stopping line coal pillar reserved width setting condition, and setting a mining stopping line coal pillar according to the mining stopping line coal pillar reserved width setting condition. According to the method, the key layers ar