<p>Nickel-modified LaNi_<i>x</i>Co_1<i>-x</i>O₃ powder with a granular morphology was synthesized by a hydrothermal method, and the corresponding Ag-based electrical contact materials were prepared by powder metallurgy combined with a cold extrusion technique. The effects of Ni content on the microstructure, physical properties, and arc-erosion behavior of Ag/LaNi_<i>x</i>Co_1<i>-x</i>O₃ electrical contact materials were investigated. The results showed that as the doped Ni content increased, the modified LaNi_<i>x</i>Co_1<i>-x</i>O₃ powder retained an ideal perovskite-type crystal structure and exhibited a grain-refining effect. In addition, the resistivity of the materials increased because of enhanced electron scattering due to grain refinement. With Ni doping, the Ag/LaNi_0.1Co_0.9O₃ materials exhibited the best antiarc erosion performance, with the lowest and most stable contact resistance (an average value of 17.54 mΩ and a standard deviation of 14.07), a moderate arc energy and duration (make-arc: 1.03&#xa0;J and 11.63&#xa0;ms; break-arc: 0.60&#xa0;J and 6.86&#xa0;ms), and low compositional segregation. The Ag/LaNi_<i>x</i>Co_1<i>-x</i>O₃ electrical contact materials developed in this study have potential applications in the field of electrical contacts. This study provides a reference for the preparation of novel silver-based electrical contact materials.</p>