This paper reports a piezoelectric transducer circuit based on multi cantilever consisting of piezoelectric transducer module, rectifier module, storage module, voltage regulator module and load module. Comparing with the standard energy harvesting (SEH) circuit, the theoretical value of maximum average power harvesting of piezoelectric transducer circuit based on three cantilevers was increased by 300%.Simulation results by using Multisim software show that the output voltage of piezoelectric transducer circuit based on three cantilevers was 2.11 times as much as that of SEH circuit. Further, practical circuits was fabricated and the experimental results prove that the output power of piezoelectric transducer circuit based on three cantilevers was 3.12 times as much as that of SEH circuit. The efficiency of energy conversion and utilization were significantly improved.