In　order　to　achieve　a　high-performance　flexible　piezoelectric　energy　harvester　(FPEH),　a　unique　sandwich　structure,　that　is,　a　PVDF　film　filled　with　FeTiNbO6　(FTN)　semiconductor　particles　as　an　intermediate　layer　and　a　pure　PVDF　film　as　an　upper　and　lower　barrier　layer,　has　been　designed,　and　the　corresponding　PVDF-FTN/PVDFx-PVDF　(P-FTNx-P)　compact　composite　has　been　prepared　by　hot-pressing　technology.　The　special　sandwich　structure　combined　with　the　introduction　of　FTN　particles　is　beneficial　to　enhance　the　interfacial　polarization　and　the　content　of　the　electroactive　phase　in　PVDF.　Together　with　the　maximum　piezoelectric　voltage　coefficient　and　the　moderate　Youngs　modulus,　the　P-FTN15%-P　FPEH　exhibited　the　optimal　energy-harvesting　performance　with　a　high　power　density　of　110　mu　W/cm(3)　and　a　large　charge　density　of　75　mu　C/m(2)　in　cantilever　mode.　The　outstanding　design　in　this　work　is　expected　to　provide　a　new　way　for　the　development　of　high-performance　FPEH　materials.