MgO board (commonly known as magnesium oxide board) is a new noninflammable decorative material combined by magnesian cementing material with stable performance made up by MgO, MgCl2 and water after allocation and adding modifier, with neutral base glass fiber mesh as reinforcing material and light material as filler. It is made by using special production technology with the characteristics of fire protection, water proof, tastelessness, innocuity, non-frozen, corrosion resistance, non-crack, invariance, non-inflammation, high strength, low weight, convenient construction and long service life. It has compound special performance in national similar products.