The invention discloses a method for integrally sealing and separating a gas extraction drilled hole in a
coal seam, and in particular is applied to sealing of a gas extraction drilled hole in the
coal seam and gas extraction drilled holes in the adjacent
coal seams. The method comprises the following steps of: forming a sealing space in the drilled hole by filling sealing materials; extracting high-concentration gas in an initial drilled hole by using an extraction pipeline; sealing the extraction drilled hole by using materials such as accelerated
cement; and when the concentration of gas to be extracted is reduced to a relatively low level, spraying the surface of a laneway surrounding a drilling site by using sealing and separating materials, and forming a low-permeability separating layer serving as a connection channel for separating inner cracks and external air on the surface of the laneway so as to seal the extraction drilled hole. By the method, air leakage channel can be effectively sealed in the gas extraction process, and a phenomenon that air enters is avoided, so that the concentration of the gas in the extraction drilled hole is greatly increased, and the service life of the gas extraction drilled hole in the coal layer is prolonged.