The invention discloses a multi-layer ring-shaped oil rail used for a multi-point spraying combustion chamber. The multi-layer ring-shaped oil rail adopts a plurality of layers of adjacent oil rail structures, and comprises ring-shaped oil rings, oil rail cover plates, oil collecting chambers, spray nozzles and oil supply guide tubes. The spray nozzles which need to work together during grading are designed into the same layer of oil rails for supplying oil; a plurality of layers of oil rails are arranged according to the grading working sequence, and are mutually adhered and welded together to form fuel oil rails which are mutually isolated; fuel oil flows for timely cooling wall surfaces of the adjacent oil rails, so that the fuel oil is prevented from being coked on the surfaces of the oil rails; and each layer of oil rails is equipped with different quantity of notches which allow fuel oil to flow into the oil collecting chambers at different positions of the side walls of the oil rails. According to the multi-layer ring-shaped oil rail disclosed by the invention, all spray nozzles are centralized on the integrated ring-shaped multi-layer oil rail, so that simplification of the oil supply structure is realized; and the flexible design characteristics of the oil collecting chambers are utilized, so that the designs of the spray nozzles can be simplified, and the spray nozzles are easily assembled; and single spray nozzle which can be independently dismounted improves maintaining performance of the device.