The work aims to analyze the effect of TiN particles during micro-arc oxidation of magnesium alloy, and study the effect of TiN particles on hardness, wear resistance and corrosion resistance of magnesium alloy in the film. The experiment was completed by adding 2.7 μm TiN particles to the micro-arc oxidation electrolyte and fully dispersing it in the electrolyte, the concentration of TiN particles in electrolyte was set to 0 g/L, 2 g/L, 4 g/L, 6 g/L, respectively, and other experimental parameters (such as current density, frequency, duty cycle and oxidation time) were controlled identical to the same experiment. The effect of TiN particles on properties of micro-arc oxidation coatings on magnesium alloys was studied by measuring surface morphology, film thickness, film hardness, phase composition and corrosion resistance using electron microscope, coating thickness gauge, micro-Vickers hardness tester, X-ray diffractometer and electrochemical workstation. After TiN particles were added to the micro-arc oxidation electrolyte, the micro-arc oxidation film obtained under the identical electrochemical parameters became denser, thicker and harder. The oxide film was mainly composed of Mg, MgO, Mg2Zr5O12 and TiN. Polarization curves showed that compared with TiN particle-free micro-arc oxidation film, corrosion current of the film containing TiN particles decreased by two orders of magnitude. Impedance graph showed that the resistance value increased by one order of magnitude. TiN particles can enter the prepared oxide film along with micro-arc oxidation process of magnesium alloy, and can increase the film thickness and hardness, and thereby improving wear and corrosion resistance of the film.