Numerically-controlled machine tool with cutter convenient to replace

The numerical control machine tool comprises a machine base, a guide rail is fixedly connected to the upper side of the machine base, a sliding seat is slidably connected into the guide rail, a rack is fixedly connected to the upper side of the sliding seat, a tool rest is arranged on the rack, and a tool mechanism is fixedly connected to the outer wall of the tool rest. And a replacement device and a blowing assembly are arranged in the cutter mechanism. According to the numerical control machine tool convenient to replace the cutter, by using the replacing device, a pressing rod is pressed, so that a sliding plate can be driven to slide, a reset spring is compressed, a transverse rod moves in the direction of the cutter, a sliding rod is driven to move, a connecting block drives a sliding block to compress a compression spring, and a wedge-shaped block is driven to be away from a clamping groove of a cutter body; the tool body can be disassembled, operation is convenient, the tool body can be quickly disass