The utility model provides a double-pitched roof structure of a plastic mold. The double-pitched roof structure of the plastic mold comprises a first pitched roof block and a second pitched roof block, wherein the second pitched roof block is inlaid in one side of the first pitched roof block; the other side of the first pitched roof block is connected with a pitched roof base; a chute is formed in the pitched roof base; and a guide rod is connected between the pitched roof base and the second pitched roof block, is perpendicularly arranged in the chute, and can slide along the chute. When the first pitched roof block moves to the pitched upper side, the guide rod connected with the second pitched roof block vertically slides upwards along the pitched roof base, so that the second pitched roof block is transversely ejected out after ascending a certain distance. The double-pitched roof structure of the plastic mold synchronously realizes different movement directions of the two pitched roof blocks in one mechanism, so that the mold production cost and the whole processing period are largely reduced, and the movement actions are smooth without being easily clamped.