Al-Zn-Mg-Cu aluminum alloy with ultra-high strength and preparation process thereof

The invention provides an Al-Zn-Mg-Cu aluminum alloy with ultra-high strength, which comprises the following components in percentage by mass: 10 to 13 percent of Zn, 1.8 to 2.6 percent of Mg, 1.8 to 2.6 percent of Cu, 0.15 to 0.35 percent of Ce, 0.05 to 0.15 percent of Sc, 0.10 to 0.20 percent of Zr, less than or equal to 0.1 percent of impurity element Si, less than or equal to 0.15 percent of Fe, less than or equal to 0.05 percent of Ti, less than or equal to 0.15 percent of other impurity elements, and the balance of Al. The invention also provides a preparation method of the alloy. The alloy has a high mechanical property and low preparation cost.