Numerical control drilling machine convenient to clamp

The numerical control drilling machine convenient to clamp comprises a base, a numerical control drilling machine lifting frame is installed at one end of the top of the base, a lifting seat is installed on the inner side of the numerical control drilling machine lifting frame, and a rotating motor is installed in the lifting seat. The fixing mechanism is arranged, in the using process, the external rotating head is rotated to drive the second threaded rod to rotate, the second threaded sleeve and the fixing pin are further driven to move, the connector is fixed or not fixed, and the functions of replacing and fixing the drilling machine are achieved; in the using process, the rotating motor is started to drive the needed drilling machine to the position above the limiting groove, the electric push rod is started to descend, the positioning block and the positioning groove are clamped to achieve positioning installation of the drilling machine, and therefore machining of different hole diameters can be achiev