本发明公开了一种汽车结构件用高力学性能、高流动性压铸铝合金及其制备方法以及应用。一种汽车结构件用高力学性能、高流动性压铸铝合金，组分包括：Si8.0%‑12 .0%、Mn0 .4%‑1 .2%、Mg0 .1%‑0 .6%、Sr0 .01%‑0 .2%、Fe0 .005%‑0 .25%、Ni0 .1%‑1 .5%，余量为Al和不可避免的微量杂质，其中 ，微量杂质中的单个元素含量≤0 .1%，微量杂质总量≤0 .3%。其应用于汽车受力结构件，包括副车架、减震器支座。能够均衡地提升抗拉强度、屈服强度、延伸率，整体表现较为全面，铸造性能好，与ADC12流动性相当，利于铸造，可以在现有压铸生产线上快速投产，无需大量投资，利于汽车工业发展。

The invention discloses a die cast aluminum alloy with high mechanical properties and high fluidity for automobile structural parts, a preparation method and　application thereof. The invention relates to a high mechanical properties and high fluidity die-casting aluminum alloy for automobile structural parts. The　components include: si8.0% ‑ 12.0%, mn0.4% ‑ 1.2%, mg0.1% ‑ 0.6%, sr0.01% ‑ 0.2%, fe0.005% ‑ 0.25%, ni0.1% ‑ 1.5%. The balance is al and inevitable trace　impurities, in which the content of single element in trace impurities is ≤ 0.1%, and the total amount of trace impurities is ≤ 0.3%. It is applied to stressed structural　parts of automobile, including subframe and shock absorber support. It can improve the tensile strength, yield strength and elongation in a balanced way, with　comprehensive overall performance and good casting performance, which is equivalent to the fluidity of ADC12, which is conducive to casting. It can be put into　production quickly on the existing die-casting production line without large investment, which is conducive to the development of automobile industry.