Clamping device of laser cutting machine

The utility model discloses a clamping device of a laser cutting machine, which is characterized in that a central hole is arranged in the middle of a cross-shaped support frame, a material to be cut passes through the central hole, a vertical open slot and a transverse open slot are respectively arranged on the front side wall and the rear side wall of the cross-shaped support frame, and the vertical open slot and the transverse open slot respectively correspond to a vertical part and a horizontal part of the cross-shaped support frame; clamping mechanisms are arranged in the vertical open groove and the transverse open groove and clamp a to-be-cut material from the upper side, the lower side, the left side and the right side of the to-be-cut material, the cross-shaped supporting frame is sleeved with the rotating supporting ring, the rotating supporting ring and the cross-shaped supporting frame are fixedly connected, worm gear insections are arranged on the outer side of the rotating supporting ring, and a