Drilling device for large steel member

The utility model relates to the technical field of steel member processing, in particular to a drilling device for a large steel member, which comprises a shell, a drilling mechanism is arranged on the inner wall of the shell, a servo motor is fixedly connected to one side of the shell, a rotating rod is fixedly connected to the top of the shell, a worm gear is fixedly connected to the outer wall of the rotating rod, a worm is meshed with the front end face of the worm gear, and a worm is meshed with the worm. The outer wall of the worm is rotationally connected with an outer frame, and one end of the worm is fixedly connected with a motor. A servo motor drives a double-end stud to rotate when working, the servo motor drives a vertical plate to move, the vertical plate drives an air pressure rod to move, an air pressure cylinder drives a drilling machine to move, the distance between two drilling holes is adjusted after the positions of the drilling machines are adjusted, the air pressure cylinder drives the