The invention provides a numerical control machining machine which comprises a mechanical system and a numerical control system. The numerical control system is used for controlling the mechanical system to operate; the mechanical system comprises a rack and a motor; the motor is installed on the rack; a clamping device is installed on the rack; a machining mechanism is arranged inside the clamping device; a feeding device is arranged at the upper end of the machining mechanism. The numerical control machining machine is characterized in that a clamping adjusting mechanism is further arranged on the clamping device; the clamping adjusting mechanism is movably connected with the clamping device; the clamping adjusting mechanism comprises a clamping vertical block seat and a clamping vertical block; the clamping vertical block is fixed to the clamping vertical block seat; the clamping vertical block is clamped in the lower portion of the inner side of the clamping device. By means of the numerical control machining machine, the position of the clamping device is adjustable, the operation is simple, and convenience and practicability are achieved.