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Superhydrophobic coatings have been prepared in this work by spraying toluene solution with different ratios of grafted epoxy resin and hydrophobic silica nanoparticles. Characterization by Fourier-transform infrared spectroscopy, scanning electron microscope, water contact angle techniques indicates that grafting with octadecylamine can effectively improve the hydrophobic property of epoxy resin with WCAs as high as 101.6 ± 3.1°, and that addition of SiO₂ nanoparticles makes the superhydrophobic coatings of SiO₂/grafted epoxy resin feasible provided that the weight percentage of SiO₂ is over 35%. Moreover, the nanocomposite coatings exhibit good abrasion resistance as verified by the abrasion tests. Finally, the superhydrophobic coating is utilized to fabricate a superhydrophobic stainless-steel mesh on which the oil/water separation can be achieved with high efficiency and low cost.