The invention discloses a valve gate disc. The valve gate disc comprises a gate disc body and a nut, wherein the gate disc body is integrally formed by a valve plate and a valve rod, the interior of the gate disc body is of a hollow structure, the nut is positioned at the upper part of the gate disc body and is connected with a valve screw rod, a sealing ring is arranged between the outer side ofthe nut and the inner wall of the valve rod, the outer surface of the gate disc body is wrapped in a plastic body, positioning holes are formed in the two sides of the valve plate, and positioning columns corresponding to the positioning holes in position are arranged on the inner wall of the plastic body. According to the valve gate disc, the gate disc body is integrally formed by caprolactam, alight-resistant agent, a heat stabilizer, a fiber material and graphite through injection molding, wherein the light-resistant agent, the heat stabilizer, the fiber material and the graphite are addedin proportion, and the advantages that the energy-saving and environment-friendly effects are achieved, the processing technology is simple, the rate of finished products is high, the environment isnot polluted, and the labor intensity of workers is low are achieved; and the outside of the gate disc body is wrapped in the plastic body, so that the metal valve plate is isolated from a fluid, it is guaranteed that a water source is not polluted, processing is easy, materials are saved, and the cost is low.