The　FeCoCrNiBx　high-entropy　alloy　coatings　were　prepared　by　laser　cladding.　The　effect　of　boron　addition　on　microstructure,　hardness　and　wear　resistance　of　FeCoCrNiBx　high-entropy　alloy　coating　were　investigated　by　X-ray　diffraction　(XRD),　scanning　electron　microscopy　(SEM),　hardness　and　wear　testers.　The　results　show　that　with　the　boron　addition　increasing,　the　structure　of　alloys　change　from　fcc　structure　to　fcc　structure　with　M3B　phase　precipitation,　and　M3B　phase　are　mainly　borides　of　Cr　and　Fe.　Meanwhile,　the　granular　and　short　rod-like　M3B　phase　is　precipitated　in　the　coatings.　And　a　blocky　M3B　phase　forms　with　boron　addition.　Microhardness　and　wear　resistance　are　significantly　enhanced　by　the　formation　M3B　phase.　The　microhardness　increases　from　4470　to　8480　MPa,　and　the　wear-loss　of　FeCoCrNiBx　high-entropy　alloy　coating　decrease　with　boron　addition.　©,　2015,　Rare　Metals　Materials　and　Engineering　Press.　All　right　reserved.