7075 aluminum alloy plate with excellent anodic oxidation performance and preparation method of 7075 aluminum alloy plate

The invention discloses a 7075 aluminum alloy plate with excellent anodic oxidation performance and a preparation method thereof, the aluminum alloy comprises the following components in percentage by mass: 2.1-2.3% of Mg, 5.1-5.3% of Zn, 1.2-1.3% of Cu, less than or equal to 0.10% of Fe, less than or equal to 0.06% of Si, less than or equal to 0.03% of Mn, less than or equal to 0.01% of Zr, less than or equal to 0.03% of Cr, 0.01-0.03% of Ti and the balance of Al and inevitable elements, each inevitable element is less than 0.03%, and the total amount of the inevitable elements is less than 0.10%. The method comprises the following steps of smelting, degassing, filtering, casting, soaking treatment, saw cutting, surface milling, preheating, rolling, edge cutting, transverse cutter plate cutting, solid solution quenching, stretch straightening, aging and saw cutting. By means of the method, the problems that an existing 7075 aluminum alloy plate is low in anodizing yield, an oxidation film is insufficient in