The invention discloses a blank making technology of an aluminum ingot, and relates to the technical field of aluminum ingot processing technologies for remelting. The blank making technology of the aluminum ingot comprises the following steps that S1, molten aluminum is prepared, and specifically, the aluminum ingot is put into an aluminum melting furnace and heated up to be transformed into themolten aluminum; S2, furnace transferring is carried out, and specifically, the molten aluminum is transferred into a holding furnace; S3, heat preservation and temporary storage are carried out, specifically, the temperature in the holding furnace is 700 DEG C-750 DEG C, the intensity of pressure in the furnace is 2-3 times as high as the standard atmospheric pressure, the humidity in the holdingfurnace is no more than 75%, and the heat preservation time is held for 10 min-20 min; S4, pressure casting is carried out, and specifically, the molten aluminum in the holding furnace is injected into a corresponding mould by a die-casting machine after insulation treatment; S5, cooling is carried out, specifically, the mould is taken down and is subjected to the cooling treatment, and the molten aluminum is gradually formed in the mould; and S6, burrs are polished, specifically, the mould is opened, castings are taken out and the burrs on the castings are polished manually, so that workblanks are obtained. According to the blank making technology of the aluminum ingot, quantity of air holes in the workblanks is reduced, and fracture of the workblanks is reduced, so that defective indexis reduced.