The invention discloses a composite slide bed bedplate formed by means of forging for high-speed railway turnout. The composite slide bed bedplate comprises a lower layer and an upper layer. The lower layer is a base material, and the upper layer is a covering material; the base material is a rolled carbon steel plate; the covering material is a welding wire layer. Welding wires are welded on the base material by the aid of gas-shield automatic welding processes to obtain a blank, and the blank is heated until the temperature of the blank reaches 900DEG C, and then is subjected to forge forming by the aid of dies. The composite slide bed bedplate has the advantages of excellent toughness and remarkable comprehensive technical performance.