High-strength aluminum plate strip and preparation method thereof

The invention discloses a high-strength aluminum plate strip and a preparation method thereof, and belongs to the field of aluminum alloy strip preparation. The high-strength aluminum plate strip comprises the following components in percentage by weight: less than or equal to 0.06% of Si, 0.13-0.20% of Fe, less than or equal to 0.1% of Cu, 0.30-0.50% of Mn, 6.0-6.5% of Mg, less than or equal to 0.05% of Cr, 0.20-0.4% of Zn, less than or equal to 0.02% of Ti and the balance of Al and other impurities generated in the manufacturing process, the content of each impurity is less than or equal to 0.03%, and the total amount of the impurities is less than or equal to 0.15%. The yield strength is not less than 350mpa, and the ductility is not less than 12%. The aluminum alloy is subjected to surface sand blasting treatment, so that crystal grains in the aluminum alloy are of an approximately equiaxial structure, the product has high strength and excellent anodic oxidation appearance quality after surface sand blast