Abstract: The structure and corrosion resistance of copper zinc alloy composite coating prepared by low-pressure cold spraying on magnesium alloys were studied. The copper zinc alloy composite coating was prepared on the surface of magnesium alloy by low-pressure cold spraying technology. The structure and corrosion behavior of the coating were studied by microscopic observation, binding force test, electrochemical polarization method and electrochemical impedance spectroscopy test. The results show that the low-pressure cold spraying method can be used to prepare copper zinc alloy composite coatings on magnesium alloys. The alloy particles in the coatings are tightly bonded after large plastic deformation,and the coating structure is dense and the porosity is low. The copper zinc alloy composite coating has a strong bonding property with the magnesium alloy substrate. The bonding force obtained by the binding fore test exceeds 23 MPa, and the tensile fracture occurs inside the coating. The bonding force between the coating and the substrate is strong. The copper zinc alloy composite coating has better corrosion resistance in salt solution. Its self-corrosion potential is significantly higher than that of the magnesium alloy substrate. The self-corrosion current is significantly smaller than that of the substrate. The long-term immersion corrosion maintains high resistance, and the coating has long-lasting excellent protection effect.