FeCoCrxNiB　(x=0.5-3)　high-entropy　alloy　coatings　were　prepared　by　laser　cladding　on　45　steel.　The　oxidation　experiments　of　the　FeCoCrxNiB　high-entropy　alloy　coating　with　different　Cr　ontent　were　performed　at　temperature　of　900,　and　the　corresponding　oxidation　kinetics　curves　were　tested.　The　structure　and　morphology　of　the　oxide　layer　were　studied　by　adopting　the　analytical　methods,　such　as　XRD,　SEM,　and　EDS.　The　results　show　that　FeCoCrxNiB　coatings　obey　the　parabolic　law.　With　increasing　Cr　content,　the　oxide　film　of　the　FeCoCrxNiB　coatings　gradually　changes　from　Fe-rich　oxide　to　Cr-rich　oxide,　and　finally　generates　a　stable　and　continuous　film　of　Cr2O3.　The　surface　morphology　of　the　Fe-rich　oxide　film　is　needle-like　and　loose,　while　the　Cr-rich　oxide　film　is　granular-like　and　dense.　The　oxidation　resistance　of　the　FeCoCrxNiB　coatings　is　improved　with　increasing　of　Cr　content.　When　the　content　of　Cr　is　more　than　x=2,　better　antioxidant　properties　of　the　FeCoCrxNiB　coatings　obtained.　©　2016,　Editorial　Office　of　CHINA　SURFACE　ENGINEERING.　All　right　reserved.