The invention discloses an anti-jamming threshing cylinder. The anti-jamming threshing cylinder comprises a machine frame and a first threshing bin, wherein the first threshing bin is arranged on the machine frame with the front portion higher than the rear portion, a brake wheel and an engine adjusting device are arranged on the bottom of the machine frame, the engine adjusting device comprises a first cross bar and a second cross bar, the first cross bar is parallel to the second cross bar, and a first cross bar adjusting hole and a second cross bar adjusting hole are formed in the length direction of the first cross bar and the length direction of the second cross bar respectively. By the adoption of the anti-jamming threshing cylinder, the corn threshing rate is increased, corn kernels are prevented from being damaged during threshing, safety performance is improved, the service life of a transmission belt is prolonged, transformation cost is low, and the threshing speed is increased.