The invention provides a multi-material sorting
system and method for a long logistics conveying line. The multi-material sorting
system comprises materials, a long conveying line, a rejection line, amarking device, a sorting device, a plurality of sorting lines, a warehouse
management system and a PLC, wherein a rejection joint, a plurality of sorting joints and an outlet joint are arranged on the long conveying line in the conveying direction respectively; the marking device marks each material; the sorting device guides the materials on the long conveying line to the rejection line or thesorting lines; the warehouse
management system allocates a target address to the sorting lines; the warehouse
management system allocates the target address to the rejection line for the materials which fail to be marked; and the PLC judges whether the materials reach the target address or not and controls the sorting device to conduct sorting. The rejection line is additionally arranged at the head end of the long conveying line, and a
material recovery line is additionally arranged at the
tail end of the long conveying line, so that unmarked materials can be efficiently and accurately conveyed to the rejection line; and in addition, the materials which do not enter the sorting lines in the sorting process are directly conveyed to the
material recovery line, so that the
utilization rate of each sorting line and the material warehousing accuracy are improved.