For harvesting effectively the broadband and low frequency vibration energies in real environment,a V shaped bistable piezoelectric generator which does not contain magnet is designed in this work.And it′s mechanical electric transfer model is established. The output characteristic of the piezoelectric generator is simulated and tested. The results showed that the V shaped piezoelectric generator can generate stochastic resonance when the initial angle is within a certain range,and the system can effectively harvest the broadband low frequency vibration energies. The structure of V shaped piezoelectric generator does not contain magnets,so,it is easy to realize miniaturization and integration.