Under the traditional cantilever fixed mode， the frequency band of piezoelectric vibrators is narrow， which has the prob? lems such as poor environmental adaptability and low power generation efficiency. Therefore， a broadband self-tuning piezoelectric vibrator is proposed by changing the fixed position. The tuning model is established， and then the power generation performance of the piezoelectric vibrator at different fixed positions is simulated and analyzed. It is verified by experimental method. The results show that the proposed self-tuning piezoelectric vibrator can achieve tuning in the above range of f~2.1f. At the same time， by ad? justing the appropriate duty cycle， the tuning device can achieve self-sufficiency. When the sleep time is more than 411 s， the tun? ing in the maximum frequency range can be realized， and the energy collection efficiency can reach more than 40%. In addition， when the charging time and excitation acceleration are the same， but the excitation frequency is different， the charging efficiency of the piezoelectric vibrator with the tuning device is improved by 223% compared with that without tuning piezoelectric vibrator.