This system is composed of pulper, ragger, hydrapurge l and drum screem. There is one heavy-rejects outlet at the bottom oitvat body of hydrapulper. Coarse and big rejects in waste paper goes into trash well through heavy-rejects outlet, and use grapple toperform regular trapping and discharging. Winding impurities in waste paper is roping into rope-shape under the action of rotary pulpflow and then is drawn out by ragger. Water, slip and part of ight impurities going into trash well wil periodically enter hydrapurge l ordefiberating, and then, the accepts wil pass through screen plate and join with the accepts from pulper, and then the joining acceptswil enter the downstream process-step for being treated, meantime, the coarse and big impurities such as plastics etc. goes into drumscreen and is discharged out the system after being thickened. This system can timely eliminate bicger lioht and heavy impurities inwaste paper at the same time of continuous breaking pulp, which can avoid breaking impurities during pulp breaking and relieve load oidownstream equipment as well as enhance capacity of breaking system.