The utility model relates to a vehicle tail gas discharging reversing device comprising a horizontal tail gas discharging pipe, a vertical tail gas discharging pipe and an air valve, wherein the horizontal tail gas discharging pipe is communicated with an exhaust port of an engine; the vertical tail gas discharging pipe is communicated with the horizontal tail gas discharging pipe; and the air valve is arranged at the tail end of the horizontal tail gas discharging pipe. Through the technical scheme, when staffs work at the tail part of a car, the air valve is closed, and tail gas is discharged from the top of the car instead of the backward through the vertical tail gas discharging pipe, thus, the working environment of the staffs working at the tail part of the car is greatly improved, the direct pollution to the staffs is reduced, and the health of personnel is ensured.