The invention relates to the technical field of gas extraction, and discloses a top-pressing and bottom-discharging extraction method for a crossing hole of a steeply inclined
coal seam. The top-pressing and bottom-discharging extraction method for the crossing hole of the steeply inclined
coal seam comprises the following steps: step one, site arrangement: a, uniformly arranging a plurality of high-pressure water injection fracturing holes side by side above a mined steeply inclined
coal seam roadway to be enhanced in permeability, fixedly communicating a water injection rubber
pipe to the inside of each high-pressure water injection fracturing hole, fixedly connecting a plurality of water injection rubber pipes with the same multi-way
pipe, fixedly connecting the end, which is away fromthe water injection rubber pipes, of the multi-way
pipe with an external fracturing pump, and arranging a high-pressure water injection valve on the pipe wall of the multi-way pipe. By the top-pressing and bottom-discharging extraction method for the crossing hole of the steeply inclined coal seam, upper fracturing permeability enhancement and lower pressure relief drainage can be realized, and rapid drainage work is facilitated.