The invention discloses a folding type aftertreatment space arrangement device facing a CN6 diesel engine. The folding type aftertreatment space arrangement device facing the CN6 diesel engine comprises a heat insulation sleeve, multiple modular carrier sleeves and multiple flow channel cover sleeves. Each modular carrier sleeve is of a rectangular solid flow channel structure; the modular carriersleeves are arranged side by side in a clinging way; by utilizing the clinging of flow channel flows, a heat conduction function of a catalyst carrier in a radial direction is improved; each two adjacent modular carrier sleeves communicated through one flow channel cover sleeve; and the modular carrier sleeves and the flow channel cover sleeves sequentially communicate in a staggering way so as to form an S-shaped flow channel. According to the folding type aftertreatment space arrangement device facing the CN6 diesel engine provided by the invention, original axial arrangement is innovatively replaced with folding type flow channel arrangement, so that all devices for tail gas aftertreatment are more compact in structure, all systems can be accessed into a diesel oil tail gas flow channel through a tank way, the problems of long axial direction and noncompact space of an existing CN6 tail gas aftertreatment system can be solved; and at a clinging type wall surface connecting part between each two catalyst carrier sleeves, high-temperature redundant heat is led to a catalyst requiring heat through a heat conduction manner, so that the problems that according to a CN6 system, hydrocarbon is injected into DOC but not uniform in oxidizing reaction, and a catalyst activity temperature cannot be reached can be solved.