The invention discloses a numerical control drilling machine fixing clamp which comprises a base, a supporting base and a fixing base. The supporting base is fixed between the base and the fixing base through a bolt. A machining groove is formed in the upper surface of the fixing base. A fixing block is arranged above the machining groove. A limiting block is arranged on the right side of the machining groove. A clamping tool is arranged at the lower left corner of the fixing base and comprises a shell, a screw rod and a chuck. The screw rod is located on the center line of the shell. A wheel disc is arranged at the left end of the shell and rotationally connected with the shell. The wheel disc and the screw rod are rotationally connected through threads. The right end of the screw rod is fixedly connected with the chuck. The chuck is in an L shape. By arranging the fixing block and the limiting block on the edge of the machining groove, a workpiece is more conveniently positioned, the operation difficulty is lowered, workpiece clamping is more convenient and more stable by arranging a fixing tool on the lower right corner of the machining groove, working efficiency is improved, the mechanical structure is simple, and later-period maintenance and assembly are convenient.