The utility model discloses a hollow-shaft oil-guide ring for a coal mill. The hollow-shaft oil-guide ring is characterized by comprising oil-guide rings, bolts and a hollow shaft, wherein the oil-guide rings are connected to the hollow shaft through the bolts, the oil-guide rings are higher than the shaft neck of the hollow shaft, the hollow shaft is provided with two oil-guide rings, and the diameter of each oil-guide ring is greater than that of the hollow shaft. The hollow-shaft oil-guide ring disclosed by the utility model has the advantages that the structure is simple; under the condition of not affecting the strength of the hollow shaft, oil at the top of the oil-guide ring is high in speed and quick in settlement; the diameter of each oil-guide ring is greater than that of the shaft neck of the hollow shaft, lubricating oil slowly overflows to both sides, so that the retention time of the lubricating oil is long, therefore, an effect of full lubrication is achieved, and a mill is running safely; and the hollow-shaft oil-guide ring is convenient to use and easy to replace.