Clamping device

The invention discloses a clamping device, and relates to the technical field of clamps, the clamping device comprises a supporting sleeve, a double-thread screw, a bearing assembly and a clamping jaw assembly, the double-thread screw is rotatably arranged in a mounting space and extends towards an object placing opening, and the double-thread screw is provided with a first rod section and a second rod section which are connected and opposite in screw direction. The bearing assembly is meshed with the first rod section, the bearing part can move between the bearing position close to the storage opening in the radial direction and the placing position away from the storage opening in the radial direction, and the clamping jaw assembly is arranged in the installation space and meshed with the second rod section. And the clamping part can move between a radially contracted clamping position and a radially expanded releasing position. According to the clamping device, the clamping jaw assembly is in the state tha