The utility model aims at providing a combine harvester which can fully lower exhaust gas temperature. The combine harvester is provided with a driving part, a threshing device (6), a grain box (7), an engine (4) and an exhaust pipe (9), wherein the driving part is arranged in the front of a running machine body, the threshing device (6) and the grain box (7) are parallelly arranged at the back of the driving part along the left-right direction of the machine body, the engine (4) is arranged below the driving part, and the exhaust pipe (9) enables exhaust gas coming from the engine (4) to be discharged into the air. The exhaust pipe (9) is provided with an exhaust pipe main body (10) and an extension part (11), wherein the exhaust pipe main body (10) passes between the threshing device (6) and the grain box (7) and at least extends to the upper end of the threshing device (6) from the engine (4), and the extension part (11) is installed at the end of the exhaust downstream side of the exhaust pipe main body (10). A gap (22) for enabling the outside of the exhaust pipe (9) to be communicated with the inside of the exhaust pipe (9) is formed between the exhaust pipe main body (10) and the extension part (11).
