Extracting energy from environment vibration by piezoelectric effect to power wireless sensor nodes has been an attractive field of research, and the key challenge is to design environmentally friendly piezoelectric materials with high power density. In order to alleviate this issue, lead-free Mn-modified Ba0.9Ca0.1Ti0.93Zr0.07O3 (BCTZ) ceramics were prepared, and the energy harvesting characteristics were optimized by addition of Mn ions. The results showed that the construction of R-O-T phase boundary and uniform dense microstructure boost the high energy harvesting characteristics at x = 0.1 specimen. In the mode of the cantilever-type energy harvester, a high power density of 1.2 W/mm(3) and efficiency of energy conversion of 7% were obtained at x = 0.1 specimen under an acceleration of 1.0 g. In addition, the BCTZ energy harvester possesses outstanding and stable performance after a 10(6) cycles, as well as strong toughness against severe vibration environments.