Numerically-controlled machine tool capable of rapidly replacing clamp

The numerical control machine tool comprises a machine tool body, a positioning seat is fixedly connected to the bottom of an inner cavity of the machine tool body, supporting plates are fixedly connected to the two sides of the top of the machine tool body, and a case is fixedly connected to the tops of the opposite sides of the supporting plates; and an inner cavity of the positioning seat is movably connected with a threaded rod through a bearing. Through the cooperative use of the machine tool body, the positioning seat, the supporting plate, the case, the threaded rod, the threaded sleeve, the limiting plate, the clamp body, the positioning hole and the limiting block, the problems that in the using process of a traditional numerical control machine tool, the function of rapidly replacing a clamp is not achieved, a fixing bolt installation mode is adopted, the disassembly efficiency is low, and the disassembly cost is high can be effectively solved. The numerical control machine tool can have the functio