<p>In order to extend the application potential of AlCoCrFeNi_2.1 eutectic high entropy alloy (EHEA) in high load and high wear-resistant extreme environments, AlCoCrFeNi_2.1 EHEA and AlCoCrFeNi_2.1+10NbC EHEA composite coating were prepared by laser cladding method. The effect of NbC on the microstructure, Vickers hardness, and wear properties of AlCoCrFeNi_2.1 EHEA were systematically investigated. The AlCoCrFeNi_2.1 EHEA coating is composed of FCC and BCC phases. After the addition of NbC, the AlCoCrFeNi_2.1+10NbC composite coating consists of FCC, BCC and NbC phases. The microhardness of the composite coating is significantly improved, and the hardness is about 483 HV0.5, which is a 69% enhancement compared with that of the AlCoCrFeNi_2.1 EHEA coating with no added NbC. Due to the increase in hardness, the AlCoCrFeNi_2.1+10NbC composite coating exhibited the outstanding wear resistance with the wear rate of 3.04 × 10⁻⁵mm⁻³ N⁻¹.m⁻¹ and friction coefficient of 0.6. The results provide theoretical basis for the application of EHEA in strengthening coatings.</p>