The utility model relates to a warehouse in/out conveying system of a turnover box stereoscopic warehouse. The system comprises a warehouse front pallet conveyor, turnover box unstacking/stacking equipment, an RFID (radio frequency identification) label scanning and supplement-attaching device, a double-layer caching mechanism and a turnover folding box machine, which are sequentially connected and arranged. According to the utility model, a double-layer structure for automatically classifying and queueing turnover boxes meets the requirement of storing multiple varieties at the same time, and improves the utilization rate of the warehouse front space; and due to the design of an annular processing area, the smoothness of the flow and the accuracy of the goods information are ensured.