Energy　harvesting,　which　can　translate　the　wasted　vibration　energy　into　electric　energy,　is　now　a　hot　topic　in　the　field　of　new　energy,　and　the　key　point　is　to　design　high　power　piezoelectric　ceramic　according　with　the　requirements　of　low-frequency　vibration　energy　harvesting.　In　this　study,　high　quality　Co-modified　0.2Pb(Zn-1/　Nb-3(2/3))O-3-0.8Pb(Zr0.50Ti0.30)O-3　(PZN　PZT　+　Co)　ceramics　have　been　prepared　by　the　two-stage　method,　and　the　energy　harvesting　characteristics　were　investigated.　The　results　showed　that　the　hierarchical　nanodomain　structure　boosts　the　strong　piezoelectric　activity,　leading　to　the　high　energy　harvesting　performance.　The　PZN　PZT　+　Co　ceramic　sintered　at　1000　degrees　C　exhibits　an　excellent　d(33)　x　g(33)　value　of　14080　x　10(-15)　m(2)/N,　which　are　much　larger　than　that　of　commercial　PZT-based　ceramics.　In　the　mode　of　the　cantilever-type　energy　harvester,　the　output　voltage　and　energy　density　of　33　V,　4.4　mu　W/mm(3)　were　obtained　at　a　low　resonance　frequency　of　85　Hz　and　acceleration　of　10　m/s(2),　showing　potential　application　in　piezoelectric　energy　harvester.