The insulation sandwich panel consists of two layers of metal sheets (such as steel plates, aluminum plates, etc.) and one layer of core material with excellent insulation performance. This sandwich structure enables the insulation sandwich panel to have both the strength and rigidity of a metal plate, as well as the insulation and fire resistance properties of the core material. The insulation sandwich panel adopts construction methods such as prefabrication and on-site splicing, and the installation process is simple and fast, shortening the construction period.