Zinc-Aluminum-Magnesium steel coil ( zn-mg-al plate) is a new type of high-corrosion-resistant coated steel plate. Its zinc-plated layer is mainly composed of zinc, which is composed of zinc plus 11% aluminum, 3% magnesium and a trace amount of silicon. The thickness range of the current steel plate can be produced is 0.13mm—6.00mm, and the production width range is: 580mm—1524mm.