The work aims to prepare organic conductive coating on the micro-arc oxidation ceramic layer on the surface of the magnesium alloy (AZ31) to achieve the function of corrosion prevention and conduction. On the surface of the micro-arc oxidation layer prepared in the previous stage, inorganic conductive carbon black was added, and different ratios of organic anti-corrosion conductive coatings were prepared by knife coating method. The microscopic morphology of the coating was observed by field emission electron microscopy, the corrosion resistance of the coating was tested electrochemically, and the coating resistance was measured by a four-electrode four-probe tester. The addition of inorganic conductive carbon black particles to the organic matter had a great influence on the morphology of the material. With the addition of conductive particles, the surface quality of coating decreased and more cracks appeared. Compared with the material with only micro-arc oxidation coating, the corrosion potential was increased by 0.6~0.68 V. The conductive carbon black could effectively improve the conductivity of the coating and when the carbon black was added in an amount of 10 wt.%, the average resistance of the coating was only 70 Ω. Due to the sealing and inert reaction, the organic coating can further improve the corrosion resistance of the micro-arc oxidation coating. Due to the tunneling effect of the conductive carbon black particles and the conductive network, the conductivity of the coating is greatly improved.