The utility model provides a sound structure is inhaled to side wall behind automobile, belongs to automobile structure field, this sound structure is inhaled to side wall behind automobile includes by back wheel casing, outer panel beating, the interior panel beating cavity structure that frame and C post panel beating enclose of ventilating after, what set up with it closely laminating in the cavity structure inhales the sound cotton, inhales the sound cotton and sets up to L shape structure, include with outer panel beating, interior panel beating and C post panel beating closely the laminating long end and set up the short of frame top edge of ventilating after and hold, the effect of the convenient multifunctional horizontal discharger is beneficial in that, sound structure is inhaledto side wall behind automobile reasonable in design, overall structure is stable, but active absorption cavity structure passes to the noise in the automobile body, and absorbing effect is good, hasimproved the travelling comfort that the passenger drove.