Light sandwich constructional board

The utility model relates to a light sandwich constructional board. The utility model is mainly composed of a surface layer, a heat-insulating layer, a reflection layer and a bottom layer. The surface layer is made of chromatic galvanized steel board, the both ends and the middle of the surface layer are provided with ribs, and the section of each rib is a mushroom-shaped clamping mouth. The surface layer, the heat-insulating layer, the reflection layer and the bottom layer are assembled to an integrative structure on a pressing machine by adopting adhesives. The rib of one end of the surface layer is a negative rid of solid core, and the rib of the other end of the surface layer is a positive rid of hollow core. When the utility model is used, the surface of the utility model is not needed to be perforated with holes; so the utility model has the advantages of good waterproof property, no water leakage, high fireproof grade, simple structure and easy operation. The utility model is mainly used for the construction of the large-sized industry factory building, civil architecture, etc.