This　paper　presents　a　special　piezoelectric　energy　harvester　system　which　is　obtained　by　separating　the　end　of　the　upper　piezoelectric　layer　of　the　traditional　piezoelectric　cantilever　beam　from　its　basic　layer.　A　mass　I　is　located　at　the　end　of　the　separated　upper　piezoelectric　layer　(SUPL),　a　mass　II　and　a　permanent　magnet　I　are　located　at　the　end　of　the　separated　lower　piezoelectric　beam　(SLPB)　and　a　permanent　magnet　II　is　added　in　the　opposite　position　of　the　permanent　magnet　I　and　they　face　each　other　with　same　polarities.　A　nonlinear　magnetic　force　which　can　broaden　the　frequency　bandwidth　of　the　system　is　generated　mutually　on　the　two　permanent　magnets.　Studies　find　that　this　special　piezoelectric　energy　harvester　has　extremely　high　energy　capture　efficiency.　In　order　to　further　explore　the　reason　of　high　efficiency,　experimental　research　on　its　dynamic　behavior　is　carried　out.　The　experimental　results　show　that　the　vibrations　of　the　SUPL　and　the　SLPB　are　relatively　simple.　The　dynamic　behaviors　of　the　SUPL,　the　SLPB　and　the　unseparated　part　are　different.　The　unseparated　part　of　the　piezoelectric　shows　relatively　complex　nonlinear　phenomenon　due　to　the　interaction　of　nonlinear　magnetic　force　and　the　collision.　With　the　increase　of　the　external　excitation　frequency,　period　doubling　motion　and　almost　periodic　motion　appear　alternately.　Copyright　©　2018　ASME.