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An aluminum alloy contains 3-7wt％of Si, 5-10wt％of Zn, 1-5wt％of Cu, 1-3wt％of Mg, 0-0.3wt％of a rare earth element, 0-1wt％of an additional element, and 73.7-90wt％of Al. The additional element is at least one selected from a group consisted of Ti, Zr, Mn, Fe, Cd, Cr, B, Bi, Ni and Sr. A method of preparing the aluminum alloy is also provided.