In order to improve the small intelligent components of vibration isolation, vibration reduction and power generation capacity, a kind of liquid piezohydraulic energy harvester was designed, the use of sheet deformation superposition theory under the action of concentrated load was established for the electricity generating capacity of the circular piezoelectric vibrator displacement curve and calculation model. Research results showed that the prisoner can implement the output voltage, which was proportional to the driving voltage in a fixed frequency, output voltage of captive can increase with the increase of system back pressure, power voltage was increased firstly and then decreased, and the best voltage back pressure existed to maximize the voltage, and the best back pressure was affected by the frequency. Mechanical and electrical equivalent model was established, by changing the circuit impedance equivalent analysis, the results were consistent with the theoretical simulation results, the established circuit model can true reflect characteristics of the theoretical model.