The invention discloses a method for optimizing the corrosion resistance of a nickel-based electrode, and belongs to the technical field of electrode performance optimization. The method comprises thesteps of depositing nickel ions and phosphorus ions in a chemical plating solution on a surface of the nickel-based electrode; and controlling the operating parameters such as deposition time, temperature, and pH of a plating layer so that a Ni-P alloy coating layer is formed on the surface of the electrode. P is excellent in corrosion resistance, so the Ni-P coating layer can protect battery electrodes and improve the corrosion resistance of the battery electrodes and slow the corrosion dissolution rate of the battery electrodes. The method is easy to operate; the prepared plating layer is dense and uniform and flat in surface and is tightly combined with the battery electrode body; the problem of corrosion and dissolution of the electrode in the operating environment is effectively relieved; and the method plays an important role in prolonging the life and optimizing the performance of the molten carbonate fuel cell.