The utility model discloses an adjustable wide frequency damping muffler, wherein a pipe joint (2) is connected with three lumped parameter vibration systems which respectively have high, middle and low frequency range characteristics, the structure of each lumped parameter vibration system is that a shell (3) is connected on the pipe joint (2), an inner cavity thereof is communicated with the inner cavity of the pipe joint (2), the inner cavity of the shell (3) is separated into an upper cavity and a lower cavity by\ a movable vibrating body (7) which is arranged in the shell (3), a damper hole (8) is arranged on the vibrating body (7), one end on the shell (3), which is far from the pipe joint (2) is provided with an adjusting nut (4), a first spring (9) is arranged in the lower cavity, a second spring (6) is arranged in the upper cavity, and a pressing plate (5) is arranged between the adjusting nut (4) and the second spring (6). The adjustable wide frequency damping muffler has small volume and excellent filter effect, and can adjust resonant frequency to adapt to work condition change.