The utility model discloses a threshing device carried on a full-rod input type combine harvester, which is provided with a threshing cylinder, wherein the threshing cylinder uses a support shaft as a fulcrum to be rotatably driven, thereby implementing threshing treatment to harvested cornstalks which is supplied to a support port of a threshing chamber from a feeder, and erecting the front wall and the rear wall of the threshing device, which are spanned by the support shaft on the front-rear direction. The threshing cylinder comprises a plurality of bar-shaped parts, support parts and a plurality of threshing gears, wherein the bar-shaped parts are prepared in parallel along the peripheral direction of the threshing cylinder in a posture along the support shaft, the support parts are arranged on the front and the rear portions of the support shaft in a mode of supporting the bar-shaped parts, the threshing gears are arranged in parallel along the front-rear direction on the bar-shaped parts in a protruding posture from the bar-shaped parts to the outer side of the threshing cylinder, and the bar-shaped parts are made from circular tube steels or circular bar steels. The front end portion of the threshing cylinder on the front-rear direction is formed with a pawing-in portion, the pawing-in portion paws and carries the harvested cornstalks which are supported and carried to the front end portion along the rotating of the threshing cylinder.