The invention discloses an overhead conveying system of a disassembly line for a scrapped automobile. The overhead conveying system is connected with a front assembly conveying system of the disassembly line, and comprises a supporting overhead frame and a sliding line, wherein the sliding line is arranged on the supporting overhead frame, one end of the supporting overhead frame is a scrapped automobile input end which is connected with the front assembly conveying system, the other end of the supporting overhead frame is a scrapped automobile output end, elevators are arranged at the scrapped automobile input end and the scrapped automobile output end, exits are arranged between the scrapped automobile input end and the scrapped automobile output end, and lead to an engine disassembling station and a rear axle disassembling station, and a self-propelled trolley is arranged on the supporting overhead frame, can automatically slide along the sliding line, and is used for grabbing the scrapped automobile to move from the scrapped automobile input end to the respective exits. According to the technical scheme, respective disassembling stations can be connected effectively, and the scrapped automobile can be quickly moved to the respective disassembling stations for disassembly through the self-propelled trolley, so that high conveying efficiency is realized, and therefore disassembling efficiency of the whole disassembly line for the scrapped automobile is increased; and moreover, as the overhead conveying system is controlled by a PLC (Programmable Logic Controller), the automation degree is high.