It is of great significance to study the protective effect of the corrosion inhibitor on PCB in a specific environmentfor revealing the corrosion law of PCB under the protection of corrosion inhibitors, and strengthening the anti-corrosionmaintenance work of electronic equipment. The protective effect of three special corrosion inhibitors for electrical and elec.tronic equipment on PCB in a typical tropical marine atmosphere is studied by means of an atmospheric exposure test under shelter. By observing and comparing the surface corrosion morphology, EDS analysis and on-resistance test of samples withdifferent sampling periods, the protective performance of different corrosion inhibitors is ranked. From the perspective ofmacroscopic corrosion morphology, the protective effect is H2>H1, H3> No inhibitor; from the perspective of microscopic cor. rosion morphology and product composition, H3 has a better anti-corrosion effect than the other two inhibitors; according tothe analysis of electrical performance parameters, the protection effect is H2,H3>H1> No inhibitor.