In order to effectively broaden the silence frequency band of acoustic liner, a new type of flexible wall acoustic liner structure with multistage cavity is proposed to overcome the shortcomings of the strong noise elimination selectivity of Helmholtz resonators, the specific and non-adjustable silence frequency band and inflexibility of the traditional single acoustic liner. The single stage rigid wall of the traditional acoustic liner was replaced by a new type of multistage flexible wall made of aluminum alloy material, and the volume of the flexible cavity was adjusted by applying the voltage, so that its slience frequency band was widened and shifted. Based on selecting transmission loss as the silence performance evaluation index of the new type of multistage flexible wall acoustic liner, the static and dynamic performance simulation and actual performance test of the flexible wall were carried out, respectively. According to the simulation results and the actual test results, it was determined that the flexible wall had better deformation performance and noise reduction performance. Then, through the introduction of multistage flexible wall acoustic liner structure design method, the acoustic liner sample was further processed and the test platform was set up to conduct the performance test. The experimental results showed that the transmission loss of multistage flexible wall acoustic liner was peaked at 1 386 Hz when the voltage was not applied, that was, the resonance frequency was 1 386 Hz. When the driving voltages were -100, 100 and 200 V, respectively, the resonance frequencies were 1 420, 1 370 and 1 364 Hz. By adjusting the voltage amplitude, the slience frequency band of the multistage flexible wall acoustic liner achieved 56 Hz offset. The proposed multistage flexible wall acoustic liner has a certain effect for the suppression of noise in broadband.