Zn-Al eutectoid alloy (ZA22) has ultra-high damping property, but its mechanical properties are still relatively low. In order to simultaneously improve the tensile strength and plasticity, a novel Al matrix composite inoculant containing in-situ formed Al₂O₃ and Al₃Zr particles was designed and used to reinforce the ZA22 alloy. The microstructure of the ZA22 alloy was significantly refined. Fine Al₂O₃ particles were uniformly distributed in the α phase and the lamellar eutectoid structure, whereas Al₃Zr particles were distributed in the α phase and at the α/η interface. Property tests showed that the tensile mechanical properties of the reinforced ZA22 alloys were significantly improved. The maximum tensile strength and elongation reached 355 MPa and 7.62%, which were 1.50 and 1.89 times those of the original ZA22 alloy, respectively. The increase in mechanical properties is attributed to the multiple strengthening and toughening factors constructed in the refined microstructure.