［Objective］ To improve the adhesion phenomenon of gelled oil aggregates duringcrude oil gathering and transportation.［Methods］ A superhydrophilic/underwater superoleophobiccomposite coating was successfully fabricated by a synergistic preparation method combining multilayerspraying and polymer cross-linking. In this process，a blended system consisting of polyvinyl alcohol（PVA）chitosan（CS），and titanium dioxide nanoparticles（TiO₂）was used as the base layer，aqueous glutaralde，hyde（GA） solution as the cross-linking layer，and polydopamine（PDA） solution as the reinforcing layer. The wettability of the coating was evaluated by measuring the water and oil contactangles. Additionally，the surface composition and micro-morphology of the coating were characterized by Fourier transform infrared spectroscopy（FT-IR） and scanning electron microscopy（SEM）. Meanwhile，the durability and underwater oil adhesion resistance of the coating were tested.［Results］ The coating was cured at 80 ℃ for 3 hours after spraying the aqueous GA solution，and then reacted at 80 ℃ for 1 hour followed by curing at 60 ℃ for 2 hours after spraying the PDA solution. The resultingcoating exhibited a water contact angle of 5. 4° in air and underwater oil contact angles exceeding 160°for various oil types. GA successfully cross-linked CS，PVA，and PDA，forming a dense cross-linked network. The outer PDA layer significantly enhanced the surface hydrophilicity and the adhesionstrength to the substrate. After 100 friction cycles and 100 peeling tests，the coating still maintained awater contact angle of approximately 10° and an underwater oil contact angle of more than 160°. Whentested in a stirred pipeline oil transportation simulation device for crude oil adhesion resistance andsalinity tolerance，the composite coating showed stable crude oil adhesion resistance.［Conclusion］ The prepared composite coating exhibits excellent durability and outstanding resistance to crude oiladhesion.