The invention discloses a stocking system. A preordering passage is connected between a warehouse discharge line body and a conveying line body and consists of one group or more than one group of conveying passages parallelly connected between the conveying line body and the warehouse discharge line body, the conveying line body conveys cargos ordered according to the warehouse discharge sequence into the corresponding group of conveying passages in the preordering passage, the corresponding group of conveying passages store the cargos ordered according to the warehouse discharge sequence, when the sorting line cargo ordering instructions from a corresponding sorting line are received, the cargos ordered according to the warehouse discharge sequence are sequentially pushed to the warehouse discharge line body according to a first-in first-out principle, and the cargos ordered according to the warehouse discharge sequence are conveyed to the corresponding sorting line by the warehouse discharge line body. Simultaneously, the invention also discloses a stocking method, when the system and the method disclosed by the invention are adopted, the influence on the subsequent sorting process flow caused by abnormal conditions in the stocking process is reduced, and the fault resistance and interference resistance capability of the stocking system are improved.