Inorganic foam heat insulating material and preparation method thereof

The invention relates to an inorganic foam heat insulating material and a preparation method thereof. Raw materials for preparing the inorganic foam heat insulating material comprise cement paste and foam. The cement paste is mainly formed by Portland cement, sulphoaluminate cement, pulverized coal ash, silica fume, expanding agent, coagulant enhancer, water reducing agent, waterproof agent, fiber and water according to a certain proportion. The foam is mainly formed by foaming agent, foam stabilizer and water according to a certain proportion. Compared with the prior art, the inorganic foam heat insulating material has the advantages of high heat insulating performance, light weight, high strength, low water absorbability, high crack resistance, high fireproof performance and long service life.