［Objective］To effectively provide early warning of coating damage，metal substrate corrosion，and extend the service life of organic coatings.［Methods］Using electrospinning technology， polyacrylonitrile（PAN）core-shell nanofibers loaded with 8-hydroxyquinoline（8-HQ）and fluorescein（FL）were prepared，and epoxy resin was drop-coated onto the fiber surface to obtain a fiber-resincomposite coating. The morphology of the nanofibers was observed by scanning electron microscopy（SEM）and transmission electron microscopy（TEM）. The chemical composition of the nanofibers wasstudied using Fourier transform infrared spectroscopy（FT-IR）and thermogravimetric analysis. The release performance of the loaded materials and the corrosion inhibition performance of 8-HQ in the fibers were investigated using ultraviolet absorption spectroscopy and laser confocal scanning microscopy（CLSM）. The anticorrosion performance of the coating was studied using SEM，energy dispersive spectroscopy（EDS）， X-ray photoelectron spectroscopy（XPS）， and electrochemical impedance spectroscopy（EIS）.［Results］ The PAN@8-HQ/FL nanofibers exhibited uniform fiber diameters and a layered core-shell structure，and were successfully loaded with 8-HQ/FL，showing good release performance. According to EIS results，the damaged composite coating had a corrosion inhibition efficiency of 95. 1% after 144 hours，demonstrating excellent anticorrosion performance.［Conclusion］The study found that when only the composite coating was damaged，the released FL could emit green fluorescence under UV light. When the damage reached the metal substrate，the 8-HQreleased from the damaged composite coating could form a black complex with Fe3 . generated bycorrosion，filling the microcracks after coating damage and providing a corrosion-isolating effect，thus achieving dual functions of layered self-warning and corrosion inhibition for microscopic coatingdamage.