Motor box cover machining and fixing mechanism

The utility model discloses a motor box cover machining fixing mechanism which comprises a workbench, one end of the workbench is fixedly connected with a motor, the output end of the motor is in key connection with a screw rod, the screw rod is rotationally connected in a sliding groove, the outer wall of the screw rod is sleeved with a sliding plate in a threaded mode, the sliding plate slides in the sliding groove, and the top of the sliding plate is rotationally connected with a rotating disc. The top of the sliding plate is fixedly connected with a fixing block, one side of the fixing block is slidably connected with a push-pull column in an inserted mode, one end of the push-pull column is sleeved with a spring, one end of the push-pull column is fixedly connected with a marking-off plate, the marking-off plate makes contact with the rotating disc, a plurality of protruding blocks are integrally formed on one side of the marking-off plate, the protruding blocks make contact with the rotating disc, and t