To enhance the anticorrosive resistance of epoxy resin coating and endow themwith self-healing property，a novel composite epoxy resin coating was prepared by graftingphytic acid onto ethylene glycol diglycidyl ether catalyzed by tetrabutylammonium bromideand doped with nano-Al₂O₃ mixed into epoxy resin. The influence of the mass fraction of nano-Al₂O₃ on the anticorrosive resistance of the coating was investigated，along with tests on its surface morphology，gloss，mechanical properties，self-healing ability，and anticorrosive resistance. The results showed that the addition of modified phytic acid and nano-Al₂O₃ significantly improved the surface smoothness，gloss and hardness of the epoxy coating. Whenthe content of modified phytic acid was controlled at 5% and the nano-Al₂O₃ content reached 5%，the composite coating exhibited a hardness of H，the self-corrosion current density reached 7. 85×10^-8 A/cm²，and the corrosion potential was -0. 805 V. In addition，the composite coating demonstrated excellent self-healing properties. The introduction of modifiedphytic acid and nano-Al₂O₃ significantly enhanced the anticorrosive resistance，self-healing ability，and durability of the epoxy resin coating.