The invention belongs to the technical field of motor vehicle exhaust systems, and particularly relates to a
broadband noise reduction
muffler. The
broadband noise reduction
muffler comprises a shell, baffles and cavities, wherein the baffles and the cavities are arranged inside the shell, the baffles include the first baffle, the second baffle and the third baffle which are arranged in sequence, the cavities include the first cavity, the second cavity, the third cavity and the fourth cavity, an air inlet
pipe penetrating through the front end face of the shell, the first baffle and the second baffle and an air outlet
pipe penetrating through the first baffle, the second baffle, the third baffle and the rear end face of the shell are arranged inside the cavities. The first baffle, the second baffle and the third baffle are provided with a first
punching region, a second
punching region and a third
punching region respectively. The
pipe walls, on the first cavity and the second cavity, of the air inlet pipe are provided with a fourth punching region and a fifth punching region respectively. The fourth punching region is sleeved with a first sleeve. The pipe wall, on the second cavity, of the air outlet pipe is provided with a sixth punching region. The sixth punching region is sleeved with a second sleeve. The first sleeve, the second sleeve and the fourth cavity are each internally provided with a sound absorbing material.