Combined die for box die casting

The utility model discloses a box die-casting combined die which comprises a lower die and an upper die, the top of the upper die is provided with an inserting groove, a material storage barrel is inserted in the inserting groove, the outer wall of the material storage barrel is sleeved with a heat preservation sleeve, the top of the upper die is fixedly connected with a pneumatic push rod, and the top end of the pneumatic push rod is fixedly connected with a pressing plate. The bottom of the pressing plate is fixedly connected with a pressing rod, the bottom end of the pressing rod is fixedly connected with a movable plug, the movable plug slides in the material storage barrel, a heating wire is embedded in the wall thickness of the material storage barrel, the bottom of the material storage barrel is provided with a butt joint, the outer wall of the bottom of the material storage barrel is fixedly connected with a plurality of positioning rods, and the top of the upper mold is fixedly connected with a posit