Objective To study the effect of silicon content on the micro-structure, hardness and wear resistance of FeCoCr0.5NiBSix high-entropy alloy coatings. Methods FeCoCr0. 5NiBSix high-entropy alloy coatings were prepared on 45 steel substrate by laser cladding. The macro-morphology, microstructure and phase structure of the coating were analyzed, the hardness of the coating was tested and the wear resistance of the coating was tested using the friction wear experiment. Results The as-cladding alloys were composed of FCC phase and M2 B phase, and the microstructures of the coatings were composed of pro-eutectic microstructure and eutectic microstructure. With the increase of silicon content, the volume fraction of FCC phase increased, while that of M2 B phase decreased, the shape of eutectic changed from cellular to granulate and then disappeared. The average hardness of the coating first decreased and then increased with the increasing silicon content. The FeCoCr0. 5 NiBSi0. 3 coating had the minimal hardness, which was 613HV, whereas the FeCoCr0. 5 NiBSi0. 4 coating had the maximal hardness, which was 820HV. The wear volume first increased and then decreased with the increasing silicon content. The wear volume of FeCoCr0. 5 NiBSi0. 3 coating was the maximum, which was 0. 004 06 mm3 , whereas the friction volume of FeCoCr0. 5 NiBSi0. 4 coating was the minimum, which was 0. 002 33 mm3 . Conclusion With the increase of silicon content, the volume fraction of M2 B phase decreased, and the eutectic microstructure disappeared gradually, the wear resistance of coating first increased and then decreased. The abrasive resistance of the FeCoCr0. 5 NiBSi0. 4 high-entropy alloy coating was the best.