Aluminized zinc magnesium alloy coating is a kind of alloy coating in the surface steel. The mass fraction of metal elements in the coating is : 53 % aluminum, 43 % zinc, 2 % magnesium, 1.5 % silicon and other elements.The surface of aluminized zinc-magnesium steel plate has a fine zinc pattern formed by crystallization, and the neatly arranged fine zinc pattern makes the appearance of the plated product more natural and delicate. The special resin protective film is coated on the surface, so that the surface of the product maintains a smooth metal luster. The zinc flake of Al-Zn-Mg steel plate is smaller and more uniform than that of Al-Zn steel plate.Aluminized zinc-magnesium steel plate can be used directly as a finished product or as a substrate for color coated plates. It can be mainly used as roof and wall materials for steel structure building enclosure systems. The final application includes roofs, walls, ceilings, and shutter doors of industrial plants, power plants, stadiums, airports, exhibition halls, or civil residences. At the same time, its excellent formability and ductility can also be applied to manufacturing industries, such as pipelines, furniture, electrical backplanes, auto parts, etc.