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This paper implements parallel synchronized triple bias-flip (P-S3BF) interface circuit for piezoelectric energy harvester based on general synchronized multiple bias-flip model. By increasing the efficiency of the interface circuit, it is expected that under given piezoelectric device and load resistor, more energy can be harvested by the piezoelectric energy harvesting system. This paper also gives a detailed analysis of the circuit operation principle. Simulation results proved that P-S3BF outperformed standard energy harvesting (SEH) circuit. Voltage across the load resistor and energy harvested on the load resistor are 223% and 497% higher on P-S3BF compared to SEH, respectively. Besides, the control method proposed in this paper is simpler than the original control method. An extensive space in the SMBF model circuit area can be expected if significant performance increase is achieved with SMBF circuit after the control method is simplified and the whole circuit become more integrated.