［Objective］To solve the problem of hydrophobicity degradation of protective coatings caused by mechanical wear and chemical erosion during service. Octadecylamine（ODA） is encapsulated in periodic mesoporous organosilica（PMO） to obtain PMO@ODA fillers. This fillers enable the coating to release ODA responsively even after being damaged several times，therebyendowing the coating with hydrophobicity self-healing function and improving its hydrophobicity andcorrosion resistance.［Method］ PMO@ODA filler loaded with ODA was prepared by a one-potmethod. The EP/PO composite coating was prepared by incorporating 3%PMO@ODA into modifiedepoxy resin. After being damaged by etching or grinding，the coating self-repaired by heating at 80 ℃， then its performance was evaluated by electrochemical tests and salt spray test.［Results］The water contact angle of EP/PO coating was 102°，indicating good hydrophobicity. After 5 cycles of etching-repair or grinding-repair，the water contact angle remained stable（102° after etching-repair and 142° after grinding-repair）. When immersed in 3. 5%NaCl solution for 28 days，the low-frequency impedance modulus was still over 10¹⁰ Ω·cm²，and the metal showed almost no corrosion；after 30 days of salt spray test，only slight corrosion was observed at the scratches.［Conclusion］The EP/PO composite coating has excellent hydrophobicity，self-healing ability and corrosion resistance. ODA can be released responsively to achieve hydrophobicity repair，providing an effective solution to the problem of performance degradation of coatings during service.