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Bisphenol A type benzoxazine, alicyclic epoxy resin and mesoporous TiO₂ nanoparticles were blended and cured to form a ternary BET_mes coating by spray coating process. The surface of BET_mes coating can be reversed between hydrophilic and hydrophobic through alternate treatment with UV illumination and heating. The chemical composition of this BETmes coating was quantified, its surface morphology was observed, and the mechanism of reversible surface wettability was clarified. The conversion ratio of Ti-O-C/C-OH groups was maintained at 1.00:1.00. Additionally, the wear resistance of composite BETmes coatings was evaluated by wear testing. This surface exhibited excellent mechanically robust properties because of hydrophobicity retained after abrasion with SiC sandpaper (240 mesh) for 400 cm at an applied pressure of 2.5 MPa. Thus, a membrane with reversible wettability for oil-water separation was developed with this coating, which conveniently generated water. After over five cycles of reutilization, the separation flux was maintained at higher than 3000 L m^?2 h^?1, peaking at 3318 L m^?2 h^?1. In conclusion, mechanically robust coatings with reversible surface wettability, which are prepared based on this system, are feasibly applicable to real environments.