EPS sandwich panel production process adopts the colored steel plate as surface board, and the core material is the self-extinguishing closed cell polystyrene foam, It is a kind of high-strength composited building materials, and it was formed in the automated continuous molding machine, by combining the pressed colored steel with the High Strength Adhesives. It has the characteristics of complete insulation and fire-proof, fast construction speed, durability, and beautiful appearance, etc. so it is widly used as roofing material for steel structure plant.