The invention provides a combine provided with an exhaust processing device in an excellent state without being affected by dusts; the combine comprises the following structures: an original acting portion (8) positioned in the front side of a machine body, and provided with an engine (21); a grain box arranged behind the original acting portion and used for storing threshed grains; a first exhaust processing device (46) used for reducing particle materials contained in the exhaust gas of the engine (21); a second exhaust processing unit (47) used for reducing nitric oxide contained in the exhaust gas processed by the first exhaust processing device; the second exhaust processing device is arranged below the front side of the grain box, and can overlap with the grain box in a look down manner.