The present invention relates to a muffler, the muffler includes a hollow cylindrical muffler net and a casing wrapping the muffler net, muffler cotton is arranged between the casing and the muffler net, the casing, the muffler cotton and the muffler net are arranged in parallel, the muffler further comprises a mounting member arranged on two ends of the muffler net, a mounting through hole is arranged in the middle part of the mounting member, the upper end face of the mounting member is provided with a cutting face, muffler net holes are arranged on the middle part of the lower end face of the mounting member, the muffler net holes and the mounting through hole can be coaxially arranged, the muffler net can be clamped and embedded by the muffler net holes, a casing groove capable of clamping and embedding the casing is dug on the outer side face of the mounting member, and the casing is made of a composite material which comprises, 40-50wt% of epoxy; 5-20wt% of alkali-free glass fiber; 15-30wt% of mineral fiber; 0.5-5wt% of a flow modifier; 1-3wt% of a heat modifier; 3-5wt% of a compatibilizer; 0.3-0.5wt% of a primary antioxidant; 0.3-0.5wt% of a secondary antioxidant and 1-3wt% of a processing aid. The muffler is simple in structure, the casing is made of the composite material, the mounting member is made of a reasonable compatibility material, and the use efficiency and the service life of the entire blast blower can be further improved.