Cylinder sleeve inner hole knurling device

The utility model discloses a cylinder sleeve inner hole knurling device. Machine tool, a motor is arranged on the machine tool; the motor comprises a motor rotating shaft; a connecting seat is arranged on a rotating shaft of the motor; a fixed clamping seat and a four-jaw chuck are arranged on the connecting seat; wherein the fixed clamping seat is of a hollow cylindrical structure, the four-jawchuck is embedded in the fixed clamping seat, the four-jaw chuck is provided with a movable clamping jaw, an arc-shaped movable clamping jaw wall used for clamping a cylinder sleeve is welded to the movable clamping jaw, and an annular protruding step used for abutting against one end of the cylinder sleeve is arranged on the inner wall of the movable clamping jaw wall. The machine tool is provided with a mechanical arm, a cutter clamping plate is fixedly connected to the mechanical arm, and a knurling cutter is connected to the cutter clamping plate. The clamping device is simple in structureand convenient to operate