<p>MCrAlY-based coatings are widely applied in metallurgy and aerospace engineering. In the present work, a CoCrAlTaY-Al₂O₃ spraying powder was prepared by spray granulation and vacuum sintering. Subsequently, (1-<i>x</i>) CoCrAlTaY-<i>x</i>Al₂O₃ (<i>x</i> = 0, 10, 20, 30%, wt.%) cermet coatings were fabricated by atmospheric plasma spraying (APS) technology, and the effects of Al₂O₃ doping concentrations on the microstructure, phase composition, mechanical properties, and wear behavior of the cermet coatings were investigated. The results showed that most of the CoCrAlTaY-Al₂O₃ spraying powder particles were spherical with uniform composition and diameters ranging from 15 to 45&#xa0;μm. The CoCrAlTaY-Al₂O₃ coating was relatively dense and contained few pores. Al₂O₃ doping had no significant effect on the phase composition of the coating that was mainly composed of Al₅Co₂, Cr, α-Al₂O₃, θ-Al₂O₃ and γ-Al₂O₃. As the content of Al₂O₃ increased, the Vickers hardness and porosity of the cermet coating gradually increased. The bonding strength of CoCrAlTaY coating decreased after adding Al₂O₃, and the coating with 30% doping Al₂O₃ had a maximum hardness of 758.3 HV_0.3 and a relatively high bonding strength of 48.7&#xa0;MPa. The wear mechanism of the CoCrAlTaY-Al₂O₃ coating was mainly abrasive wear at room temperature, and the doping of Al₂O₃ reduced the amount of adhesive wear. Aa the Al₂O₃ doping content increased, the wear volume and wear rate of the grinding ball gradually increased, implying that the wear performance of the CoCrAlTaY-Al₂O₃ coating was significantly improved after adding Al₂O₃.</p>