Die-casting aluminum alloy capable of being anodized and preparation method thereof

The invention discloses a die-casting aluminum alloy capable of being anodized and a preparation method of the die-casting aluminum alloy capable of being anodized. The die-casting aluminum alloy capable of being anodized comprises 0.7 wt% to 0.9 wt% of Mn, 0.2 wt% to 0.5 wt% of Ti, 0.05 wt% to 0.2 wt% of Fe, 0.03 wt% to 0.05 wt% of Be, 0.01 wt% to 0.1 wt% of Zr, 0.01 wt% to 0.05 wt% of Cr, 0.001 wt% to 0.02 wt% of Sr and the balance Al and impurities, and the total content of the impurities is smaller than or equal to 0.3 wt%. The invention further discloses a preparation method of the alloy. The aluminum alloy material obtained through the preparation method has the good die-casting performance, is suitable for die-casting forming of small and medium-sized castings and non-thin-wall castings which are complex in structure and have special shapes, can achieve the appearance effects of good coloring and uniform and stable color after anodic oxidation, meanwhile has the good comprehensive mechanical performanc