To improve the corrosion resistance and antifriction properties of cast aluminum alloy (ZL109), firstly, the micro-arc oxidation coating was prepared on the surface of aluminum alloy by micro-arc oxidation technology, and then the samples treated by micro-arc oxidation were immersed in the electrophoretic solution composed of acrylic resin and nickelplated carbon nanotubes for electrophoretic deposition. Finally, the micro-arc oxidation/electrophoretic deposition composite coating was prepared on the surface of ZL109. The morphology and bonding characteristics of the composite coating were characterized by SEM, EDS and scratch test, and the corrosion resistance and antifriction properties of the composite coating were tested and analyzed by electrochemical workstation and friction and wear tester. The electrochemical corrosion test results show that the corrosion current density of the sample treated by micro-arc oxidationelectrophoretic precipitation is 8.891×10 ^-7A /cm², which is three orders of magnitude lower than that of the matrix, and the polarization resistance is increased by 277.46 times. The friction and wear tests carried out under dry friction conditions show that the friction coefficient of the sample treated by micro-arc oxidation/electrophoretic precipitation is about 65% lower than that of aluminum alloy matrix and 25% lower than that of the sample without nickelplated carbon nanotubes. The corrosion resistance and antifriction properties of aluminum alloy are improved by micro-arc oxidation / electrophoretic deposition, which provide a reference for the protective treatment of aluminum alloy.