The molding of the suction molding machine takes many steps to achieve the operation of the suction molding machine through the joint combination of seven devices. When plastic sheet material is formed, the sheet material is fixed on the clamping device. In the heat molding general and compound heat molding machine, more and more easy to fix the various sizes of sheet material clamping device. Some are the entire molding machine with a clamping frame. The lower part of the frame of various types of single position molding machine is directly fixed on the molding room.