Abstract: To solve the problems that seriously corrosive anchor net supporting materials (protective steel nets) in the wet environment of Shendong Coal Group Company, the scanning electron microscope, X-ray diffraction, Fourier transform infrared instrument and electrochemical test were conducted to analyze the morphology, structure and corrosive mechanism of protective steel nets (welded protective nets of 45# steel) taken from the coal lane, respectively. Besides, the anti-corrosion effect of protective steel net covered by the epoxy zinc-poor coating, which is composed of 32% of pigment volume concentration, was studied by immersion of simulated roof water. The results depict that the rust layer on the protective steel nets consist of α-FeOOH, γ-FeOOH, Fe2O3 and Fe3O4 with loose porous structure, leading to continuous corrosion process of the metal matrix. Meanwhile, the epoxy zinc-poor coating is valid to reduce the corrosive rate of protective steel nets down to around 0.001 mm/a by shielding effect. This strategy can effectively simplify the construction process, improve the corrosion resistance and prolong their lifespan of the protective steel nets in coal lane.