Composite silicate thermal insulation board is an inorganic weather-resistant insulation product, with main raw materials including fly ash and various natural non-metallic oxides such as aluminum, magnesium, and silicon. Through polymerization and composite foaming reactions, it forms a lightweight, high-strength, rigid porous product with a network structure. This product is suitable for various industrial and construction applications, such as petrochemicals, power generation, chemical plants, heating, heating systems, air conditioning, and refrigeration.