Cooling exhaust pipe structure for preventing backflow of automobile exhaust emissions

The utility model discloses a cooling exhaust pipe structure for preventing backflow of automobile exhaust emissions. One end of an exhaust pipe body is connected with an exhaust system upstream guide pipe of an automobile engine; the other end of the exhaust pipe body is connected with the air inlet of a PM (Particulate Matter) 2.5 capture device or a tail end muffler; the exhaust pipe body is in an arch shape; the cross section located at the top end of the exhaust pipe body is in an oval shape; the periphery of the exhaust pipe body is provided with cooling fins which are circular-piece-shaped and are formed by heat conduction materials through welding. According to the cooling exhaust pipe structure for preventing the backflow of the automobile exhaust emissions, the structure is simple, the backflow of a water solution in the PM 2.5 capture device in the driving process of an automobile can be effectively prevented, meanwhile the high temperature hot air flow in the device can be effectively cooled, and