Tail gas aftertreatment catalytic conversion muffler

The invention discloses a tail gas aftertreatment catalytic conversion muffler. The tail gas aftertreatment catalytic conversion muffler comprises a barrel 1; a sealing head 2 is arranged at an upper end of the barrel 1, while a sealing head 3 is arranged at a lower end of the barrel 1; a first separator 4 and a second separator 5 are transversely arranged in an inner cavity of the barrel 1, respectively; a carrier fixing barrel 6 is connected between one ends of the first separator 4 and the second separator 5; a catalytic carrier 15 is mounted within the carrier fixing barrel 6; a porous barrel 8 is connected between the other ends of the first separator 4 and the second separator 5; one end of the porous barrel 8 is connected with the first separator 4. A bent pipe in the catalytic muffler is S-shaped and is longer and larger in area than a traditional vent pipe; besides, after a urea solution is sprayed into the bent pipe, the urea solution can be atomized more uniformly to achieve a better effect, and urea is not prone to be crystalized. Meanwhile, the catalytic muffler is large in expansion cavity volume and good in catalytic effect and muffling effect.