Protective cover of numerical control machine tool

The utility model relates to the technical field of numerical control machine tools, and discloses a numerical control machine tool protective cover which comprises a machine tool, the machine tool comprises a base, and a protective cover body is arranged on the top of the base. The door body is mounted on the front surface of the protective cover; according to the numerical control machine tool protective cover, when a workpiece is machined, two motors are started, the motors drive a transmission rod to rotate, a first bevel gear arranged on the outer side wall of the transmission rod drives a second bevel gear arranged at one end of an electric reciprocating lead screw to rotate, and a connecting rod is arranged on the outer side wall of the reciprocating lead screw; a mounting plate is arranged at one ends of the two connecting rods on one side, and a brush is arranged on one side of the mounting plate, so that a threaded sleeve on the outer side wall of a reciprocating lead screw can be driven to move bac