Magnesium oxysulfide fire insulation board (commonly known as hollow magnesium oxysulfide board) is a special core material for color steel purification board. It is made of magnesium sulfate, magnesium oxide and other materials through lamination, pressing, and then maintaining. It is a green and environmentally friendly new purification and insulation product. Compared with other types of color steel plate core materials, it has fire resistance, water resistance, heat insulation, folding resistance, heat insulation, sound insulation, non-toxic and light weight, and neat appearance, making up for the shortcomings of some color steel purification plate core materials currently on the market., such as strength, bending resistance, bearing capacity, and insulation effect, and is especially suitable for some indoor and outdoor partitions and ceilings for specific regions (such as the north).