Differential pressure casting machine

The invention discloses a counter-pressure casting machine which comprises a machine body frame comprising a bottom plate assembly, a lower supporting column, a middle plate assembly, an upper supporting column and a top plate assembly which are sequentially arranged and connected from bottom to top, and a first mounting hole is formed in the middle plate assembly; the lower die mounting assembly is embedded in the first mounting hole, and the lower die mounting assembly can do lifting motion relative to the middle plate assembly; the upper mold mounting assembly and the lower mold mounting assembly define a cavity capable of being opened and closed, and the upper mold mounting assembly is in transmission connection with the top plate assembly so as to be driven by the top plate assembly to do lifting motion; the holding furnace comprises a furnace body and a furnace cover; the upper die mounting assembly is provided with a lifting mechanism, the lower die mounting assembly is provided with a lifting locking