High drainage roadway presplitting upper corner roof gas extraction promoting sectional type presplitting system

The utility model relates to the technical field of coal mine underground gas extraction, and provides a high drainage roadway presplitting upper corner top plate gas extraction promoting sectional type presplitting system. Comprising the steps that a coal seam is mined, the upper portion of the mined coal seam is an upper adjacent rock stratum, a stope face is arranged on the mined coal seam, and the upper adjacent rock stratum is adjacent to a goaf; a high drainage roadway is formed in the upper adjacent rock stratum in the direction facing the goaf, a plurality of fracture forming guide holes and explosive charging holes which are connected with the high drainage roadway are further formed in the upper adjacent rock stratum, and the fracture forming guide holes and the explosive charging holes are formed at intervals. The device has the beneficial effects that the guide hole and the charging hole extend to the position near the upper corner, and the upper adjacent rock stratum is blasted and pre-split in a