The invention aims to solve the problems that a gas extraction gallery has complex processes, and the construction period of the construction process and a gallery gas extraction effect cannot be simultaneously considered. The invention discloses an integrated drilling and splitting drill stem device. The device comprises a drill stem main body, a hole sealing assembly and a spurt hole assembly and has the benefits that the same set of equipment can drill holes and split a coal bed and only the pressures applied to working liquid of a drill stem need to be transformed. The integrated drilling and splitting drill stem device adopts the principle that the working liquid with different pressures enables a pressure regulation spring of the hole sealing assembly to generate different pressures to a hole sealing plug; when the pressure is high, the pressure applied by the hole sealing plug to a cone structure of the drill stem is higher and at the moment, most of working liquid is sprayed from a spurt through hole to split the coal bed.