Flow-induced　vibration　contains　tremendous　energy.　Based　on　the　theory　of　flow-induced　vibration,　a　kind　of　flow-induced　vibration　energy　harvester　with　additional　magnetic　excitation　is　designed,　and　its　vibration　energy　harvesting　characteristics　are　studied　theoretically　and　experimentally.　The　harvester　consists　of　a　piezoelectric　cantilever　beam,　a　circular　cylinder　and　magnets.　Firstly,　based　on　the　Euler-Bernoulli　beam　theory,　the　energy　functions　of　the　magneto-piezoelectric　energy　harvester　with　fluid-induced　vibration　excitation　are　derived,　and　the　electromechanical　coupling　equation　is　established　by　using　the　Hamilton　principle.　Then,　the　influence　of　the　system　parameters　such　as　the　flow　velocity,　the　diameter　and　length　of　the　circular　cylinder,　the　magnetic　parameters　and　the　external　resistance　on　the　vibration　characteristics　and　output　voltage　of　the　piezoelectric　energy　harvester.　The　results　show　that　the　vibration　amplitude　of　the　piezoelectric　harvester　produces　vortex-induced　vibration　at　low　flow　velocity　and　output　the　maximum　voltage;　the　magnetic　force　can　reduce　the　resonance　frequency　of　the　structure　and　broaden　the　bandwidth　harvester.　Thus,　the　magnetized　piezoelectric　harvester　is　more　suitable　for　low-speed　flow　environment　than　the　non-magnetized　piezoelectric　harvester.　The　experimental　results　agree　well　with　the　numerical　results,　which　verifies　the　results　of　the　theoretical　analysis　of　the　magneto-piezoelectric　energy　harvester.　©　2019,　Chinese　Journal　of　Theoretical　and　Applied　Mechanics　Press.　All　right　reserved.