The cracks will impact the toughness and wear properties in the coating formation process of micro-arc oxidation melting and cooling. This paper uses the ZrO₂ strength and toughness to prepare ZrO₂/MgO coating with self-repairing cracks, and investigates the effect of in-situ ZrO₂ on the wear properties of the coating. The research found that the in-situ synthesis ZrO₂ by micro-arc oxidation undergoes phase transition in the high-temperature discharge channel to generate volume expansion and micro-cracks initiation at the interface of zirconia, which inhibits the crack propagation during the coating formation process and realizes the role of self-repairing coating cracks.The ZrO₂ content in the coating can be regulated by controlling the content of the zirconium source, the in-situ ZrO₂ content in the coating is 32%, the cracks of the ZrO₂/MgO coating are finely dispersed, and the crack density is 63.4% lower than that of the traditional coating, the friction coefficient is reduced by 53.4%, the amount of wear descended by 66.7%. Research thinks, the in-situ synthesized ZrO2 self-repairing cracks and improvement of wear resistance during the coating preparation process, which can reduce the friction coefficient and mass loss, and improve the surface wear properties of the ZrO₂/MgO coating.