Magnesium oxychloride cement（MOC） is a kind of inorganic nonmetal material and is used widely. As it has strong adhesion and corrosion, there are higher requirements for MOC product mould. The different mold materials are used for MOC product and the influences of MOC on the different mould are investigated. The results show that the mould with aluminum alloy as matrix material and composite silicone as coatings has high strength and good salt corrosion, aging and wear resistance. The coated material-modified aluminum alloy mold in the research has characteristics of long use period and fast demolding, and it has solved the die bonding and corrosion problems of the magnesium oxychloride cement and improved the magnesium oxychloride cement production efficiency and product quality.