High　entropy　perovskite　oxides　(HEPOs)　have　received　increasing　attention　due　to　their　appealing　photocatalytic　activity.　Considering　their　excellent　ferroelectric　properties　used　as　energy　storage　capacitors,　it　is　promising　for　HEPOs　to　exhibit　remarkable　pizeo–photocatalytic　properties.　Herein,　(Bi0·2Na0·2Ba0·2K0·2La0.2)TiO3　(BNBKL)　HEPO　powders　were　prepared　by　the　traditional　solid–state　reaction　method　to　demonstrate　the　advantages　of　HEPO　in　the　piezo–photocatalytic　degradation　of　organic　contaminants.　The　results　evidence　that　the　BNBKL　HEPO　has　excellent　catalytic　activity　compared　to　traditional　piezo–photocatalysis,　which　is　fundamentally　based　on　the　high–entropy–induced　band　structure　reconstruction　and　severer　lattice　distortions,　shedding　light　on　a　viable　and　universal　strategy　for　substantially　enhancing　the　catalytic　efficiency　of　piezo–photocatalyst.　©　2023　Elsevier　Ltd　and　Techna　Group　S.r.l.