Clamp with adjustable clamping force for protecting processed surface of workpiece

The invention belongs to the technical field of clamps and in particular relates to a clamp with adjustable clamping force for protecting a processed surface of a workpiece. The clamp comprises a first screw rod, pressing mechanisms, moving mechanisms and a first screw nut, wherein one end surface of the first screw rod is fixedly mounted on an end surface of the first screw nut; two moving mechanisms are both mounted on the first screw rod; the two moving mechanisms are distributed along the axis of the first screw rod; the two moving mechanisms are symmetrically distributed on the first screw rod; three pressing mechanisms are uniformly distributed on the outer side of the first screw rod in a circumferential direction; the three pressing mechanisms are connected with the two moving mechanisms. By adopting the clamp provided by the invention, the area, pressed by the clamp, of the workpiece,is enlarged, then the purposes that the surface area, clamped by the clamp, of the workpiece is increased under the co