Aluminum alloy for automobile inner plate and preparation method of aluminum alloy

The invention belongs to the technical field of metal material manufacturing, and particularly relates to an aluminum alloy for an automobile inner plate and a preparation method thereof. The aluminum alloy for the automobile inner plate is prepared from the following raw materials in percentage by mass: 0.8 to 1.3 weight percent of Mg, 0.1 to 0.2 weight percent of Fe, 0.2 to 0.25 weight percent of Mn, 0.6 to 0.8 weight percent of Si, 0.5 to 0.7 weight percent of Cu, 0.05 to 0.1 weight percent of Cr, 0.01 to 0.1 weight percent of hexagonal boron nitride, 0.01 to 0.25 weight percent of Sc, 0.01 to 0.1 weight percent of Zr, 0.01 to 0.4 weight percent of aluminum-titanium-boron, less than or equal to 0.1 percent of other impurity elements and the balance of Al, wherein the total content of the other impurity elements is less than or equal to 0.1 percent. The aluminum alloy has good strength, corrosion resistance, tensile resistance and ductility, and machining and application of the aluminum alloy are facilitate