The invention discloses a tri-plate mold comprising a stripper plate, a front mold plate and a rear mold plate which are sequentially arranged, wherein the stripper plate is provided with a stroke pull rod which penetrates through the front mold plate and the rear mold plate; a guide post penetrates through the front mold plate and the rear mold plate; the front mold plate and the rear mold plate are internally provided with accommodating cavities; two ends of the front mold plate are respectively connected with two ends of the rear mold plate by virtue of a spring lock. According to the tri-plate mold, the spring locks are arranged on two ends of the front and rear mold plates, so that the front mold plate and the rear mold plate are connected together; during mold assembly, due to acting forces applied by the spring locks, after a product is molded by casting, the front mold plate and the rear mold plate are separated firstly, the mold unloading sequence is ensured, and the precision and quality of the product are effectively ensured.