The invention relates to an anticorrosion environment-friendly building water-based coating material and a preparation method thereof. The high-strength environment-friendly building water-based coating material contains raw materials such as graphene, hydroxypropyl methylcellulose, polyamide, magnesium phosphate, fatty acid sorbitan, polysorbate, sodium hexametaphosphate, organic silicon emulsion, epoxy silane modified silicon sol, cross-linked polyethylene, tert-butyl peroxybenzoate, sodium silicate, melamine polyphosphate, N-dodecyl mercaptan, pentaerythritol, alumina silicate fiber, silicon dioxide, 2,4,5,6-tetrachloro-3-benzenedicarbonitrile, propylene glycol monomethyl ether, propylene glycol methyl ether acetate, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, water-based polyurethane resin, acrylate, tung oil, titanium dioxide, polyvinyl alcohol, light calcium carbonate, talcum powder, titanium dioxide, silicon carbide, glass fibers, fluorine resin, water-based epoxy modified resin, styrene-acrylic emulsion and a siloxane defoaming agent. The anticorrosion environment-friendly building water-based coating material has high temperature resistance and corrosion resistance and is suitable for the coating requirements of various fields; moreover, the anticorrosion environment-friendly building water-based coating material contains no toxicity and organic solvents, has no pollution and also has the advantages of no fracturing of a coat, aging resistance, corrosion resistance and the like.