The plate feeding clamp device designed this time is based on the extensive absorption of the advanced technology of hydraulic and pneumatic clamp devices at home and abroad. The length, thickness and width of the plate are 2000mm-12000mm, 3-12mm and 500mm respectively -Developed at 1250mm. Five clamping devices are arranged on both sides of the plate, and the distance between each clamping device is 1000 mm. This can save a lot of materials, and has the advantage of reducing costs for large-scale plate production. The clamping force of the clamp is clamped by the oil cylinder, and the locking cylinder of SMC is used for expansion and contraction. It has the advantages of reliable structure, smooth transmission, material saving and sensitive action.