Double-sided composite insulating board

The utility model discloses a double-sided composite insulating board, which comprises a layer of insulating board, wherein two inorganic surface layers are combined with both the upper and the lower surfaces of the insulating board, and the insulating board is a polyphenyl board, an extruded board or a polyurethane board. The double-sided composite insulating board has the advantages that: firstly, the combustibility index is greatly increased, so that the occurrence of fires in the process of the construction and usage of a building can be prevented, and moreover, the defect of the cheap ordinary insulating board, i.e. poor fire-resisting property, is overcome; secondly, the double-sided composite insulating board not only can be attached on a wall after the construction of a main building is completed, but also can be cast in situ along with the main building, and the double-sided composite insulating board is convenient to use; thirdly, while the insulation life is greatly prolonged, the impact resistance