Casting process of aluminum alloy slab ingot

The invention relates to a casting process of a aluminum alloy slab ingot, which is particularly suitable for co-casting the aluminum alloy slab ingot with different specifications and belongs to the production technical field of aluminum processing industry. The casting process comprises the following steps of: 1, establishing casting process parameters; 2, simulating casting; 3, confirming fusant temperature in a heat preserving furnace; 4, laying out a crystallizer; 5, casting; 6, sampling from final components; and 7, cooling aluminum liquid. The casting process of aluminum alloy slab ingot is capable of casting the aluminum alloy slab ingot with two or more than two specifications at one step, and has high production safety, low investment cost and easy operation.