The invention relates to a graded homogenization technology of a 6005A aluminum alloy. The 6005A aluminum alloy is sequentially subjected to first-stage and second-stage homogenization heat treatmentand third-stage cooling. The technology comprises specific steps as follows: S1, an aluminum alloy cast rod is uniformly heated to 540-550 DEG C along with a furnace at the heating rate of 70-100 DEGC/min and kept at the constant temperature for 3-6 h; step 2, the aluminum alloy cast rod obtained after first-stage homogenization heat treatment is continuously heated to 575-585 DEG C and kept at the constant temperature for 2-5 h; step 3, firstly, air cooling: the aluminum alloy cast rod is taken out of the homogenizing furnace to be subjected to air cooling for 10-20 min, then, wind cooling:the air-cooled aluminum alloy cast rod is pushed into a cooling furnace to be subjected to wind cooling for 1-2 h; finally, water cooling: the wind-cooled aluminum alloy cast rod is cooled to the roomtemperature in a water cooling manner, thick crystalline phases are eliminated, harmful beta(AlFeSi) phases are reduced or eliminated, tiny and uniform precipitation of high-molting-point recrystallization inhibiting phases is promoted, and precipitation of thick Mg2Si phases at the cooling stage is avoided.