Based　on　the　vortex-induced　vibration　theory　and　piezoelectric　energy　harvesting　technology,　a　magnet-enhancement　vortex-induced　vibration　energy　harvester　(VEH)　is　proposed,　which　is　more　conducive　to　improve　the　energy　harvesting　efficiency　for　low-velocity　water　flow.　The　proposed　energy　harvester　consists　of　a　piezoelectric　laminated　cantilever　beam,　a　cylindrical　bluff　body　and　magnets.　First,　the　energy　harvesting　characteristics　of　vortex-induced　VEH　without　additional　magnetic　force　are　analyzed　by　fluid-solid-electrical　coupling　finite　element　simulation.　Results　show　that　the　energy　harvesting　efficiency　is　lower　in　low　flow　velocity　environment.　The　experimental　platform　of　flow-induced　vibration　energy　harvesting　is　built,　and　the　energy　capture　characteristics　of　magnet-enhancement　energy　harvester　are　discussed　in　detail.　Experimental　results　show　that　the　natural　frequency　of　the　piezoelectric　energy　harvester　with　transverse　repulsion　and　longitudinal　magnetic　arrangement　is　lower,　which　means　that　it　is　easier　to　vibrate　at　lower　flow　velocity　and　occur　vortex-induced　resonance.　Under　the　effects　of　magnetic　force,　the　vibration　deformation　becomes　larger,　the　output　voltage　coupled　with　the　vibration　frequency　bandwidth　are　therefore　improved.　As　a　result,　the　maximum　of　output　power　of　the　proposed　harvester　is　120　μW　at　the　flow　velocity　0.5　m/s,　which　is　57.8%　higher　than　that　of　the　VEH　without　magnet.　It　shows　that　the　transverse　repulsion　and　longitudinal　adsorption　magnetic　vortex-induced　VEH　has　advances　to　improving　the　energy　capture　efficiency　for　the　lower　flow　velocity　environment.