After-treatment device for diesel vehicle emission

The invention discloses an after-treatment device for diesel vehicle emission. The after-treatment device for diesel vehicle emission comprises a sleeve and an inlet air pipe, an inner end cover is arranged in the sleeve, a purifying device and a muffler device are arranged in the sleeve in an integrated mode, the purifying device comprises a carrier catalyzing device and a particulate matter trap, the muffler device comprises a hush tube and a silencer inner end cover, the hush tube is connected with a barrel body through the silencer inner end cover and a clapboard, the end of the hush tube is the air outlet hush tube, the air outlet hush tube extends outside the sleeve to connect to the air outlet end flange, the carrier catalyzing device is DIC carrier catalyzing device taking the honeycomb ceramic as the carrier, the particulate matter trap is PF/CPF semi-permeable type particulate matter trap, a foil corrugated insulation tube or a stainless steel double layer heat insulation pipe is sleeved outside the inlet air pipe. According to the practical market and environment protection requirement, the after-treatment device for diesel vehicle emission has the advantages of simple structure, reasonable design, convenient installation and low composite cost. The emission pollution problem of the diesel vehicle under the condition of idle speed or low load, frequent starting operation and the emission standard reaches the nation four-grade or five -grade standard.