Plastic stop valve

The utility model relates to a plastic stop valve which comprises a valve cover, a valve flap, a valve handle and a plastic valve body, wherein the plastic valve body and the valve cover are connected by a valve cover connecting structure, and the valve cover is at least composed of a plastic valve cover basal body and valve handle nut embedding pieces of which the periphery is embedded in the plastic valve cover basal body. A valve seat is arranged in the plastic valve body and is provided with a valve seat opening. The valve seat opening is corresponding to the valve flap which is positioned at the bottom of the valve handle. Both ends of the plastic valve body are respectively provided with an inflow inlet and an outflow outlet which are communicated to the valve seat opening. The top of the plastic valve body is provided with a valve cover connecting port which is matched with the valve cover. The utility model is characterized in that the waist of the side wall of the valve cover connecting port is provided with a concave part, and the side wall of the valve cover connecting port is provided with a groove which penetrates into the concave part from an inlet end of the connecting port. The side wall of the valve cover is provided with a convex part, and the convex part of the side wall of the valve cover is matched with the concave part of the side wall of the valve cover connecting port to form the valve cover connecting structure.