Rubber preforming device

The invention belongs to the technical field of rubber manufacturing, and particularly relates to a rubber preforming device. The rubber preforming device comprises a bottom plate, a material cylinder and a cutting ring; a supporting frame is fixedly connected to the upper portion of the bottom plate; the side, away from the bottom plate, of the supporting frame is arc-shaped, and fixedly connected with the material cylinder; the material cylinder is of a cylindrical cavity type structure; a hopper is fixedly connected to the side, away from the supporting frame, of the material cylinder; the hopper communicates with the inner cavity of the material cylinder; one end, close to the hopper, of the material cylinder is fixedly connected with a power box; and the power box is designed in a disk shape. According to the rubber preforming device provided by the invention, by arranging an extension pipe, a supporting pipe and a transmission rod, the transmission rod is driven to rotate through rotation of a motor, th