Abstract: Urushiol-cerium polymer (UCeP) coatings were prepared via UV-curing process without initiator using CeCl₃ and urushiol as raw materials. The structure and thermal stability of the coatings were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and thermal gravimetric analysis (TG). The effects of CeCl₃ amount on the physical-mechanical properties and chemical medium resistance of the polymer coatings were investigated. The electrochemical impedance spectroscopy (EIS) tests were also carried out on the prepared urushiol-cerium coatings. The results showed that under the irradiation of UV urushiol hydroxyl coordinated with cerium ions, meanwhile, the unsaturated bonds in the side chain of urushiol underwent cross-linking polymerization, resulting in the curing of the coatings. Doping CeCl₃ could significantly improve the thermal stability and alkali resistance of raw lacquer(RL) film. With the increase of CeCl₃ amount, the adhesion, hardness and corrosion resistance of the coatings first increased and then decreased. The hardness and adhesion of urushiol-cerium polymer coating with the CeCl₃ amount of 18% reached 6H and 1 grade, respectively, and its corrosion resistance was the best.