A heat-preservation fireproof board is prepared by the following raw materials: 80-100 parts by weight of magnesium oxide, 2-3 parts by weight of dimethyl silicone oil, 4-6 parts by weight of aluminum nitride powder, 20-30 parts by weight of anhydrous magnesium chloride, 3-5 parts by weight of hollow glass beads, 8-12 parts by weight of tetrapod-shaped zinc oxide whiskers, 3-6 parts by weight of aerosil, 3-5 parts by weight of polyvinyl acetate emulsion, 20-30 parts by weight of refractory materials, 3-6 parts by weight of rock wool, 3-5 parts by weight of methylisothiazolinone, 2-4 parts by weight of ferriferrous oxide, 5-8 parts by weight of methyl sodium silicate, 1-2 parts by weight of sodium dodecyl benzene sulfonate, and 130-150 parts by weight of water. By virtue of adding the multiple types of refractory materials, the board can be high in burning point and good in flame retardation effect; and with the addition of the fly ash hollow beads, the board can be good in heat insulation effect and fine in fireproof effect. In brief, the board of the invention is a novel inorganic heat-preservation and heat-insulation building material integrating characteristics of heat preservation, heat insulation, high strength, fire prevention, water proofing, sound absorption, sound insulation, and decoration.