The invention discloses an antirust high-temperature-resistant water paint additive. The antirust high-temperature-resistant water paint additive comprises the following components in parts by weight:20-30 parts of zinc oxide, 5-10 parts of fatty alcohol polyoxyethylene ether, 20-30 parts of acrylic resin, 5-10 parts of amino resin, 5-10 parts of epoxy resin, 2-5 parts of polyurethane, 3-5 partsof ammonium polyphosphate, 5-10 parts of phytate and 3-5 parts of carboxymethyl cellulose. According to the antirust high-temperature-resistant water paint additive, the acrylic resin, the amino resin, the epoxy resin and the polyurethane are mutually matched, and thus, a coating has the advantages of good light and color retention, water resistance, chemical resistance, quick drying and convenience in construction, re-coating and reworking, by addition of the ammonium polyphosphate, the high-temperature resistance of the additive is enhanced, and the practicability of the additive is improved; in a high-temperature environment, the additive can be used normally, and the performance and the quality of paint are still not influenced; and by addition of the zinc oxide and the phytate, the corrosion resistance of the additive is improved. The problem of rust on the surface of a coated article is avoided.