Sand mould casting die

The utility model discloses a sand mould casting die. The sand mould casting die comprises a sand box and molding sand, wherein the molding sand is arranged in the sand body; an injection hole is formed in the sand box; the molding sand comprises a green sand layer and a resin sand layer; the green sand layer is located between the sand box and the resin sand layer. Through the sand mould casting die, the defects of poor rigidity, low surface smoothness and high cost of castings caused due to strong box expansion force during casting by the existing sand mould casting die, are overcome; and a sand mould casting die with strong rigidity, high surface smoothness and low cost of castings is provided.