Preparation method of water-resistant fireproof bonding mortar

The invention discloses a preparation method of water-resistant fireproof bonding mortar, and belongs to the technical field of building materials. According to the method provided by the invention, firstly a modified inorganic substance is obtained by using granite and diatomaceous earth as raw materials, a fatty acid ester has hydrophobicity, so that the modified inorganic substance has hydrophobicity; the inorganic minerals are nonflammable and have excellent fireproof property, the two inorganic minerals are rich in calcium, metal ions and siliceous salts, and double bonds of methacryloxytrimethoxysilane and double bonds of an acrylic monomer are subjected to polymerization under the action of initiator azobisisobutyronitrile; a firm Si-O-Si main network structure can be formed amongpolymer molecules and between a polymer and a substrate by hydrolytic polycondensation of siloxane of the organosilicone modified acrylic resin prepared by the method, the organosilicon modified acrylic resin and the modified