Novel piston of slurry pump

The utility model relates to a special-purpose piston of a combined slurry pump. A lip of a rubber piston body which is lined with a nylon gasket expands outwards under the clamping force function of a base and a wedge-shaped pressing plate, and the lip is attached to the inner wall of a cylinder body to work. When the lip of the piston body is worn out, the wedge-shaped pressing plate is tightened continuously, the lip continues to expand, and the piston body can be used again. When the rubber piston body is worn out to a non-reusable degree, the piston body can be easily replaced. The utility model has the advantages of reuse and rapid replacement and is a renewal product of the special-purpose piston of the slurry pump.