Extruded polystyrene insulation board (XPS) is a rigid sheet made of polystyrene resin through a special process of continuous extrusion and foam molding. Its interior is a unique closed bubble structure. It is an environmentally friendly insulation material with excellent and long-lasting thermal insulation, excellent water resistance, moisture resistance, high strength and compression resistance, anti-corrosion, durability, light weight, high hardness, product reusability, environmental protection, and other excellent properties.