The invention discloses a die cast aluminum alloy surface treatment process. The process comprises the following steps that a, grinding is conducted, specifically, die cast aluminum alloy is subjectedto grinding treatment; b, sand blasting is conducted, specifically, the ground die cast aluminum alloy is subjected to sand blasting treatment; c, degreasing is conducted, specifically, the die castaluminum alloy subjected to sand blasting treatment is subjected to degreasing treatment through an alkaline solution; d, alkali corrosion is conducted, specifically, surface cleaning treatment is conducted through an alkaline solution; e, anodizing is conducted, specifically, the die cast aluminum alloy subjected to alkali corrosion is subjected to anodizing treatment, and an oxide film is formedon the surface of the die cast aluminum alloy; f, activation is conducted, specifically, the anodized die cast aluminum alloy is subjected to activation treatment; g, dyeing is conducted, specifically, the die cast aluminum alloy subjected to activation treatment is subjected to dyeing treatment; and h, hole sealing is conducted, specifically, the dyed die cast aluminum alloy is subjected to holesealing treatment. The problems that existing die cast aluminum alloy contains metal components such as silicon, copper and iron, thus, die cast metal structures are ununiform, and anodizing treatment cannot be conducted due to the fact that black spots are caused easily are solved.