An online system for disassembling a scraped car comprises a loading device and a conveying device, wherein the loading device comprises runners, the conveying device comprises at least two guide rails, moving machines and rolling beds, wherein the moving machines slide on the guide rails, the rolling beds are located on the side edges of working positions, the guide rails are located at two sides of the rolling beds in two rows, at least one moving machine is arranged on each guide rail, the runners are located on the moving machines, each moving machine is provided with a first slide driving structure which can drive the runners to slide on the moving machines, second slide driving structures which can drive the runners to slide on the rolling beds are arranged on the rolling beds, the moving machine on the guide rail on a disassembly working position is used for conveying the runners carrying the scraped car to the rolling beds, and the moving machine on the guide rail on the other side of the disassembly working position is used for receiving and sending the empty runners returned by the rolling beds. Therefore, the runners can be recycled, the car can be disassembled continuously, cars are conveyed in order rapidly, the car disassembly recycle efficiency is improved, and the cost is reduced.