Abstract: In order to remedy the shortcoming of the traditional Helmholtz muffler in having narrow noise elimination frequency band, which makes it unable to adapt to the actual environment with changeable noise frequency, a kind of Helmholtz muffler with adaptive adjustment function is proposed in this paper. A stepping motor and a crank link are used for driving the backboard of Helmholtz muffler cavity to change the noise elimination frequency. The numerical analysis is carried out by using MATLAB software and the optimal structure is obtained. The independent noise reduction control programming is carried out based on LabVIEW. Experimental results show that when the noise frequency changes from 385 Hz to 860 Hz, the designed muffler can adjust the volume of the cavity in real time, and achieve the effective noise elimination with a maximum noise reduction of 24 dB. Compared with the traditional muffler, the adaptive Helmholtz muffler not only realizes the effective noise elimination, but also realizes the adaptive frequency adjustable, and the noise elimination ability is significantly improved.