The invention provides a device for casting copper alloy under antivacuum conditions by adding zirconium, relating to the technical field of non-ferrous metal material processing. The casting device comprises an induction smelting furnace (1), a seal tooling device (2), a gate tile (3), a protective cover (4) and a crystallizer (5); the seal tooling device (2) is fixed on one side of the upper part of the induction smelting furnace (1), the gate tile (3) is fixed at the bottom at the other end of the seal tooling device (2), the lower end of the gate tile (3) is inserted into the crystallizer (5) through the protective cover (4) to form the complete device for casting copper alloy under antivacuum conditions by adding zirconium. In the invention, under antivacuum conditions, metal zirconium is added to metal liquid in the smelting furnace to produce blank; specifically, in the process of casting copper alloy, antivacuum zirconium addition technology is adopted, thus obtaining various copper alloy ingot casting blank containing zirconium, then the follow-up deformation and processing is carried out on the blank to obtain various copper processed products.