Kuangyu Technology Co. Ltd. (MACH) Patent Project, a method of anti-corrosion treatment of magnesium alloy surface by recovering carbon dioxide: carbon dioxide is injected into water to make carbonate solution, and magnesium alloy material is immersed in the obtained carbonate solution, resulting in a layer of basic magnesium-aluminium carbonate film on the surface of magnesium alloy. The method has the advantages of simple steps and easy availability of raw materials, which can effectively increase the corrosion resistance of magnesium alloy materials, rationally utilize recycled carbon dioxide, achieve the purpose of carbon dioxide reuse, and reduce the carbon footprint of magnesium alloy products.