The invention discloses a debris discharge system for paperboard processing. The debris discharge system comprises a conveyor, a guide shell, a first movable plate, a collecting box, a second movableplate, a connecting column, a hydraulic cylinder, a collecting bag, a slideway, a carrying vehicle, a fixing clamp, a first fixing rod, a second fixing rod, a power block, a clamping arm, a supportingcolumn, a fixing frame, a balance rod, a collecting groove, a fixing block, a torsion spring, a fixing shaft, a first containing groove, a clamping groove and a second containing groove. According tothe system, the first movable plate and the second movable plate are rotationally connected to the bottom of the collecting box of the automatic waste discharge device for paperboard processing, thefirst movable plate and the second movable plate are elastically connected to the torsion spring, the collecting bag is correspondingly arranged at the bottom end of the collecting box, and the collecting bag is fixed to the fixing clamp at the bottom end of the connecting column so that waste materials can automatically fall into the collecting bag when the waste materials are accumulated to reach a certain quantity, then the workload of workers is reduced, meanwhile, packaging and transferring of the waste materials are facilitated, and then the working efficiency is improved.