The invention discloses a steel structure drilling machine facilitated to disassembling and assembling a drill bit. The steel structure drilling machine comprises a base. A supporting column is fixedly connected to the right side of the top of the base, a top plate is fixedly connected to the top of the supporting column, an air cylinder is fixedly connected to the left side of the top of the topplate, the bottom of the air cylinder penetrates through the top plate and extends to the exterior of the top plate to be fixedly connected with a rotating motor, and a rotating shaft is fixedly connected to an output shaft of the rotating motor. According to the steel structure drilling machine facilitated to disassembling and assembling the drill bit, through mutual cooperation of clamping grooves, fixing shafts, supporting plates, clamping blocks, supporting springs, semicircle rings, first grooves, second grooves, first pulleys, bearing seats, first rotating shafts, driven bevel gears, rolling barrels, second rotating shafts, driving bevel gears, first handles, limiting holes, threaded grooves, threaded rods, second handles, and steel wire ropes, the action of facilitating to disassembling and assembling the drill bit is played, the disassembly and assembly process is simple, the time and labor are saved, the labor intensity of users is relieved, the drilling efficiency of the drilling machine is improved, and great convenience is brought to the users.