Rational　utilization　of　biomass　waste　into　usable　energy　is　of　great　significance.　In　this　work,　a　facile　method　was　proposed　to　prepare　porous　carbon　as　supercapacitor　electrode　by　using　biomass　waste-kapok　flower　as　a　precursor.　The　obtained　porous　carbon　exhibited　hierarchical　pores　rich　in　microporous　and　mesoporous,　containing　oxygen　from　kapok　flowers.　The　optimal　porous　carbon　ACF-4.5,　which　was　achieved　with　a　mass　ratio　of　KOH　to　the　precursor　obtained　from　kapok　flower　was　4.5:1,　showed　a　remarkable　electrochemical　performance　with　a　capacitance　as　high　as　286.8　F/g　at　1　A/g　current　density.　It　was　worth　noting　that　the　capacitance　retention　rate　can　still　reach　97.4%　after　5000　cycles,　which　indicated　that　the　ACF-4.5　supercapacitor　electrode　has　excellent　cyclic　stability.　Therefore,　a　strategy　that　not　only　utilizes　biomass　waste,　but　also　produces　high-performance　supercapacitor　electrode　in　industry　effectively　was　realized.　©　2021　Elsevier　B.V.