The work aims to enhance corrosion resistance and life of mooring rope by preparing Ni-SiC composite coatings exhibiting excellent properties. The Ni-SiC composite coatings were prepared on the surface of 22MnCrNiMo steel for mooring rope on ocean platform by adopting centrifugal force-based double-pulse electrodeposition technology. Microstructure and structure of the composite coatings were analyzed by using scanning electron microscope and optical microscope. Corrosion resistance of the coating was analyzed by performing static immersion corrosion test. The nano-SiC suspension containing 0.2 g/L SDS exhibited the best suspension property. Certain concentration of nano-SiC particles (2.0~4.0 g/L) was beneficial to obtain excellent surface morphology of Ni-SiC coating. Grain size on the composite coatings decreased gradually as the duty cycle increased. Optimal morphology of Ni-SiC coating could be obtained at the duty cycle of 50%. Provided with 2.0 g/L nano-SiC particles, corrosion mass loss of the coating was the minimum, 2.867 mg/cm2; provided with the duty cycle of 50%, corrosion mass loss of the coating was the smallest, 3.059 mg/cm2. Settling performance of nano-SiC particles in the bath containing dispersant is better than that without dispersant. The corrosion resistance of the coating obtained by adding nano-particles is better than that of the pure nickel coating. Additive amount and duty cycle of the nano-SiC particles have significant effects on microstructure and corrosion resistance of the composite coatings during the process.