Abstract: This paper proposes a piezoelectric muffler with an adjustable double silencing peak. The piezoelectric muffler can adjust the voltage and perforation rate according to the noise reduction requirements，and make the acoustic wave absorption adjustable in two low frequency bands. Firstly，the sound-solid coupling module of Comsol is used to calculate the influence of the silencing structure parameters on the frequency shift characteristics. When the perforation rate decreases，the double silencing peak shifts to low frequency，the amplitude and frequency range of the second silencing peak decrease significantly，and the position of the antiresonance point remains unchanged. When the thickness of the film increases，the first order silencing peak is basically unchanged，while the second order silencing peak moves to the lower frequency region. Secondly，the displacement of the piezoelectric thin film under different load voltages is analyzed. Finally，the experimental platform is set up to test the transmission characteristics of the structure under different voltages. Based on the inverse piezoelectric effect，the piezoelectric thin film can effectively inhibit or enhance the vibration response of the film，and change the position of the anti-resonance point. When the voltage increases from 0 to 300V，the frequency of the first silencing peak moves to higher frequency region up to 85 Hz，and the second one moves up to 125 Hz.