Cr 3C 2@CoCrNi powders with core-shell structure were synthesized via a wet chemical reduction method and subsequently employed to fabricate Cr 3C 2/CoCrNi composite coatings by laser cladding. The synergistic effects of core-shell structured powders and high-speed laser cladding (HLC) technology significantly refined the microstructure and facilitated uniform in-situ dispersion of thermally decomposed Cr 3C 2, resulting in a substantial improvement in tribological performances. Compared with the conventional laser cladding (CLC) coating, the HLC coating exhibited a threefold enhancement in wear resistance. With increasing applied potential from cathodic to anodic, the wear mechanism evolved from mechanical wear, towards a corrosion-wear synergistic regime, and finally to corrosion-dominated degradation. This work highlights the merits of HLC in fabricating medium-entropy coatings with fine microstructure and superior wear resistance.