Abstract: An aluminum alloy vacuum casting equipment is studied in this invention, including High Pressure Reactor Tank. The High Pressure Reactor Tank is equipped with guide inside. The High-pressure Reactor Tank is connected with one end of the Compressed Air Pipe. The other end of Compressed Air Pipe is connected with Booster Jar. First Casting Window and Second Casting Window are sets at top of the High-pressure Reactor Tank. The First Casting Window and Second Casting Window are equipped with First Cylinder at one side. The piston rod of First Cylinder is connected with First Connecting-rod. The First Connecting-rod is connected with the casting window cover. The High Pressure Reactor Tank is equipped with Fixed Guide and Unfixed Guide at the bottom. The High Pressure Reactor Tank is equipped with Moonpool Door. The other end of Door Connecting-rod is connected with High Pressure Reactor Tank. The Moonpool Door is connected with Third Cylinder.