The invention relates to a clamp, in particular to a movable plate clamp comprising a base, a first clamping portion, a second clamping portion and fixing bolts. The base is vertically provided with the first clamping portion and the second clamping portion which are arranged in parallel. The movable plate clamp can clamp plates according to different installation modes, parts are clamped at the bottom of the movable plate clamp, a lifting mechanism is provided for supporting the plates, and the problem that manual installation wastes time and labor is solved. When a hoisting machine is used for installation, the plates are hoisted through the clamp, and therefore damages of cables on the plates are eliminated.