In this paper, laser cladding coaxial powder feeding technology was used to successfully prepare Ni60A composite coatings with varying CeO₂ content on the surface of TC4 alloy to improve the corrosion resistance of the alloy. The CeO₂/Ni60A composite coating was characterized and tested by XRD, SEM, and EDS. The results show that an appropriate amount of rare earth oxide CeO₂ could refine the grain and improve the microstructure distribution in the coating, resulting in the formation of NiTi, Ti₂Ni, and TiC. In electrochemical detection, CeO₂/Ni60A composite coating with CeO₂ mass fraction of 3% shows excellent corrosion resistance, where its self-corrosion current density I_corr is merely 2.110 × 10^-7 A·cm^-2 and polarization impedance R_P is 190674.0 Ω·cm^-2. Rare earth oxide CeO₂ mainly accumulates at the boundary in Ni60A coating. It reduces the contact area with corrosive medium, which reduces the residual tensile stress in the coating to protect the passive film. Finally, it improves the corrosion resistance of the coating.