The　Fenton　reaction,　an　effective　advanced　oxidation　process　(AOP)　for　degrading　organic　pollutants,　requires　the　addition　of　H2O2　that　is　expensive　and　not　environmentally　friendly　to　some　extent.　It　has　been　reported　that　piezocatalysis　can　generate　H2O2　under　mechanical　excitation.　Therefore,　it　is　promising　to　carry　out　the　Fenton　catalysis　utilizing　in　situ　H2O2　generated　by　piezocatalysis.　However,　the　current　piezocatalysis-assisted　Fenton　(Piezo-Fenton)　reaction　was　realized　by　adding　piezoelectric　nanoparticles　and　Fe(II)　ions　to　pollutant　solutions,　which　would　induce　more　iron-based　chemicals　that　are　not　easy　to　recycle.　Herein,　Fe3O4-BaTiO3　nanocomposites　were　prepared　to　demonstrate　the　feasibility　of　piezo-Fenton　catalysis　without　the　addition　of　H2O2　or　Fe(II)　ions.　The　organic　dye　degradation　efficiency　of　98.2%　is　obtained　using　Fe3O4-BaTiO3　nanocomposites　in　the　acidic　solution,　one-third　and　two-thrid　greater　than　that　of　pure　piezocatalysis　and　that　of　iron-based　Fenton　reaction,　respectively.　Moreover,　since　the　piezocatalysis　process　is　the　rate-determining　step　of　the　whole　piezo-Fenton　reaction,　all　the　H2O2　generated　can　be　consumed.　Considering　that　the　solid　nanocomposites　can　be　magnetically　recycled,　piezo-Fenton　catalysis　leaves　no　additional　chemicals　in　clean　water　and　thus　provides　an　environmentally　friendly　and　low-cost　approach　for　organic　dye　degradation.　©　2024　Elsevier　B.V.