Ultrahigh-strength aviation aluminum alloy and preparation method thereof

The invention relates to the technical field of nonferrous metal processing, and discloses an ultrahigh-strength aviation aluminum alloy and a preparation method thereof. The ultrahigh-strength aviation aluminum alloy is prepared by adjusting the proportion of Zn/Mg, reasonably designing the contents of Mg, Cu, Fe and Si, strictly controlling the proportion of Fe/Si, and designing the proportion of Cr, Mn and Ti elements, and by adding the microalloying element Zr, strictly controlling the content of the Zr, controlling the proportion of multiple elements and controlling the content of multiple elements, the obtained aluminum alloy can reduce the quenching sensitivity and residual stress, be further strengthened and toughened, reduce the attenuation of the performance of plates in the thickness direction, reduce the anisotropy and meet the performance requirements of thickness and large section type aluminum alloy structural parts. According to the preparation method, on the basis of the aluminum alloy compon