The invention discloses a corrugated paper creasing device. The device comprises a workbench, wherein a conveying mechanism is arranged in the middle of the workbench, a creasing mechanism is locatedon the left side of the conveying mechanism, the conveying mechanism comprises a driving shaft and a driven shaft, both the driving shaft and the driven shaft are variable-diameter shafts, the two ends of the driving shaft and the two ends of the driven shaft are provided with driving wheels and driven wheels correspondingly, conveying belts are connected between the driving wheels and the drivenwheels, the creasing mechanism comprises a rolling and pressing shaft, the rolling and pressing shaft is composed of a rolling shaft and pressing wheels, wherein the rolling shaft and the pressing wheels are integrally machined, the two ends of the rolling and pressing shaft are connected with flange connecting pieces, and a guide side plate is located on the right side of the conveying mechanism.According to the corrugated paper creasing device, during use, corrugated paper is fed by a worker from the guide side plate, under the action of the friction force of the conveying belts, the corrugated paper is conveyed to the left, and then creasing of the corrugated paper is completed through the pressing wheels of the creasing mechanism; and the device is simple in mechanism, convenient to install, capable of achieving continuous creasing operation and good in creasing effect.