Abstract: In order to improve the corrosion resistance of 316L stainless steel and prolong its service life in the marine environment, this paper discusses the method and effect of laser cladding technology on the surface of 316L substrate by cladding pure Ni60 coating and WC+Ni60 composite coating. The WC+Ni60 composite coating combines the hardness of WC particles and the toughness of Ni60 matrix, which has better comprehensive performance and is suitable for higher strength protection of the substrate surface. The coatings were retrieved and tested by hardness tester, X-ray diffractometer and electrochemical workstation, respectively. The results show that the average cross-sectional hardness of the WC+Ni60 composite coating is 719 HV, but the fluctuation in each region is large. At the same time, the surface of the cladding layer is more resistant to corrosion than the pure Ni60 coating. The self-corrosion potential is increased by 0.12 V, and the self-corrosion current density is reduced by 2.49 × 10^-6 A/cm². This study provides a reference for the later preparation of seawater corrosion resistant composite coatings.