A compound heat preservation plate is characterized in that the compound heat preservation plate is composed of silica aerogel, polycarbamate, cement, efficient flame retardant, flame retardant, antiager D and expanded perlite in an evenly mixing and stirring mode. The compound heat preservation plate comprises, by weight, 0.5-1.5 kilograms of silica aerogel, 25-35 kilograms of polycarbamate, 4-6 kilograms of cement, 2-3 kilograms of efficient flame retardant, 0.5-1 kilogram of flame retardant, 0.1-0.3 kilogram of antiager D and 25-35 kilograms of expanded perlite which are respectively placed into a stirring pot to be evenly stirred. After prefabricated foaming, the compound heat preservation plate is prepared through drying. The compound heat preservation plate is small in hygroscopicity, low in heat conductive coefficient, extensive in temperature range, light in material quality, firm, durable and convenient to use, and completely conforms nationally advocated requirements such as fireproofing, heat preservation, environmental protection and energy saving.