Clamp

The utility model provides a clamp which is used for clamping a workpiece and comprises two sets of oppositely-arranged clamping mechanisms, and each set of clamping mechanism comprises a support rotationally connected with one end of the support of the other set of clamping mechanism; the longitudinal adjusting assembly comprises a fixed part, a sliding part and a locking part, the fixed part is fixedly connected with the support, the sliding part is in sliding connection with the fixed part, the sliding part can slide along the fixed part to adjust the longitudinal moving distance relative to the fixed part, the locking part is movably connected with the fixed part and the sliding part, and the locking part is used for locking the sliding part to the fixed part; and the transverse adjusting assembly comprises a supporting piece and a plurality of clamping jaws, the supporting piece is fixedly connected with the sliding piece, the clamping jaws are movably connected to the supporting piece, the clamping jaws