Plastic water stop plate is made of high density polyethylene (HDPE), polypropylene (PP) resin by extrusion molding process made of water stop material. Plastic water stop plate is mainly used for concrete pouring set in the construction joint and deformation joint and concrete as one of the basic engineering, such as tunnels, culverts, aqueduct, dam, liquid storage structures, underground facilities, etc. It uses the elastic deformation characteristics of polymer materials to play the role of leakage prevention and seepage prevention in the joint of building structure, and has the characteristics of corrosion resistance and good durability.