Drilling, cutting, pressing and pumping method

The invention provides a drilling, cutting, pressing and pumping method which is suitable for gas extraction of coal seams which are high in gas and low in gas permeability. The drilling, cutting, pressing and pumping method comprises punching a drill hole according to the design requirements through a drilling machine; replacing a hydraulic seam cutting drill bit after a drill rod is withdrawn, continuing to drill to the bottom of the drill hole and withdrawing the drill rod to perform hydraulic seam cutting; sealing the drill hole and performing gas drainage after the hydraulic seam cutting is achieved; switching a drainage pipeline into a pulse water injection pump station when the gas drainage capacity is in the attenuation trend and fracturing the coal seams in a pulse hydraulic fracturing mode. According to the drilling, cutting, pressing and pumping method, the effective influence range of a single hole of gas extraction drilling of the coal seams can be increased by more than 30%, the gas flow of the single hole can be improved by more than 30%, the gas extraction rate can be improved by more than 20%, the operation is simple, the influence range of drilling pressure relief can be improved, and the concentration and the efficiency of the gas extraction of the drilling can be improved.