Objective To study the corrosion resistance of Zn-Ni alloy coating. Methods By orthogonal test method, the Zn-Ni alloy electroplating technology was optimized, and the plating solution formula was obtained. The corrosion resistance of the optimized Zn-Ni alloy plating was evaluated by neutral salt spray test, and compared to those of the galvanized layer and cadmium plating layer. The influence of the main salt, complexing agent, pH value, current density and temperature on the coating corrosion resistance was analyzed. Results The optimal formula was: zinc oxide 6 ~14 g/ L, nickel sulfate 20 ~30 g/ L, sodium hydroxide 100 ~ 140 g/ L, brightener 4 ~6 g/ L, and complexing agent 50 ~70 g/ L. The Zn-Ni alloy coating obtained using this formula had a white rust occurrence time of more than 720 hours in the neutral salt spray test. Conclusion The Zn-Ni alloy coating had excellent corrosion resistance, superior to those of zinc and cadmium plating layer.