The work aims to improve surface hardness and wear resistance of titanium alloy by studying microstructure and properties of AlBxCoCrNiTi(x=0,0.5,1) high-entropy alloy. The AlBxCoCrNiTi high-entropy alloy coatings were prepared on the surface of TC4 titanium alloys by laser cladding. The effect of B content (atomic percentage) on coating morphology, microstructure and composition of the high-entropy alloy coating were studiedwith scanning electron microscopy (SEM), X-ray diffractometer (XRD) and electron probe micro-analyzer (EPMA), respectively. In addition, hardness and wear resistance of the coatings were studied with vickers hardness tester and friction-wear test. The high-entropy alloy coatings and the substrate had good overall bonding morphology. The AlCoCrNiTi high-entropy alloy coatings without Bwere mainly composed of BCC phase and (Co,Ni)Ti2 phase. With the addition of B, grains of the coatingswere refined, BCC phase content increased while(Co,Ni)Ti2 phase content decreased. Moreover, TiB2 hard phase formedin-situ in the cladding layer and increased with the addition of B. The hardness and wear resistance were proportional to B content.The AlB1CoCrNiTi high-entropy alloy coatings exhibited the highest average microhardness of up to 814HV, and it also showed excellent wear resistance, which was 7 times of that of the AlCoCrNiTi high-entropy alloy coatings without B. The increase of B content contributes to improvement of tribological propertiesof the AlBxCoCrNiTi high-entropy alloy coatings, which effectively enhance the hardness and wear resistance of titanium alloy surface.