An impact cantilever piezoelectric harvester which consists of multiple cantilever piezoelectric vibrator was proposed to improve the harvesting efficiency. The harvester could generate electric power under the functions of some outer loads such as wind, body kinetic energy and environmental vibration energy. The core part of the harvester wass the cantilever piezoelectric vibrator. The impact test wass carried out and the result shows that the resonance frequency is broadened by the action of the periodic impact load and the output power was improved. The test results show that the maximal output power of the single cantilever piezoelectric vibrator was about 0.28 mW when the frequency of the square wave impact signal wass about 21 Hz and the load was 50 kΩ. When the frequency was about 5 Hz and 8.5 Hz, the output power was 0.07 mW and 0.17 mW respectively. The research showed that the impact cantilever piezoelectric harvester could improve the power harvesting effectively.