Adding cerium complex to the silicate alkalinity electrolyte, the ceramic coating on the surface of Zircalloy-4 was prepared by constant voltage micro-arc oxidation. The existing form of the rare-earth element Ce in the ceramic coating and the influence of Ce on the coating thickness, phase composition, wear resistance and corrosion resistance were analyzed. The results show that Ce can enter the ceramic coating and exists in the form of solid solution, so that the relative proportion of t-ZrO2 and m-ZrO2 phases changes, the pores and granules are obviously reduced, the surface becomes smoother and more compact, the thickness of the coating increases, and the corrosion resistance and wear resistance are remarkably improved. The optimal addition amount of cerium complex in the electrolyte is 0.001-0.003 mol/L