The utility model discloses an oil feeding device of a torsional vibration damper. The oil feeding device of the torsional vibration damper comprises a flange, the flange is arranged on a contact face of a hydraulic tension bolt arranged at the front end of the torsional vibration damper, the flange, an oil feeding shaft and an oil feeding disk form an oil feeding shaft assembly, the oil feeding disk sequentially comprises an inner ring, a hollow supporting ring and an outer ring from inside to outside, one end of the oil feeding shaft is connected with the inner ring of the oil feeding disk through the flange, and a spacer and a plug cock are arranged at the end of the oil feeding shaft. By means of the oil feeding device of the torsional vibration damper, cost is lowered, oil feeding requirement of the torsional vibration damper is met, sealing of an oil line is guaranteed, and rotation of a diesel engine can be transmitted to an angle encoder as stably as possible.