Friction stir welding clamp with good heat insulation property

The utility model relates to the technical field of friction stir welding, and discloses a friction stir welding clamp with good heat insulation property, which comprises a working box, a driver is arranged in an inner cavity of the working box, a welding tool is arranged at the bottom of the driver, and a working table is arranged on the upper surface of a bottom plate of the working box. Supporting frames are installed on the front portion and the rear portion of the upper surface of a bottom plate of the working box, threaded rods are connected to the upper surfaces of the supporting frames in a screwed mode, clamping plates are installed at the bottom ends of the threaded rods through bearings, and heat insulation columns are evenly installed at the bottoms of the clamping plates. The heat insulation column can conduct heat insulation treatment on heat of a workpiece, so that the heat generated by machining of the workpiece is not prone to being transmitted to the surface of the clamping plate, the hardne