The utility model discloses a processing apparatus behind nozzle integrated form SCR, including intake pipe, nozzle, preceding outer end cover, preceding inner end cap, preceding interior casing, the cotton that keeps warm, preceding shell body, preceding baffle, tubule, backplate, aperture plate, carrier, encapsulation liner, encapsulation casing, back orifice plate, back casing, amortization cotton, rear end cap and outlet duct. The carrier cavity in be equipped with catalyst support catalyst support go up the coating and have the catalyst. Back processing apparatus, the nozzle integration arranges on the converter, the design is anterior at the tubule, the tubule arranges around with in the middle of the baffle that there is porous aperture plate the tubule bottom, the formation of urea crystallization can be avoided in the trompil of preceding baffle. The utility model discloses a processing apparatus behind nozzle integrated form SCR not only the nozzle integration on the converter, compact structure can also show the homogeneity that improves carrier internal reaction thing and distribute to the effectual catalytic conversion efficiency that has improved tail gas.