Milling device of coating milling machine

The utility model discloses a milling device of a coating milling machine. The milling device of the coating milling machine comprises a hollow connecting pivot, wherein a first milling disc, a second milling disc, a third milling disc and a fourth milling disc are arranged on the connecting pivot; the diameters of the first milling disc, the second milling disc, the third milling disc and the fourth milling disc are gradually reduced. The milling device of the coating milling machine can perform stirring and milling on each layer of mixtures by utilizing the first milling disc, the second milling disc, the third milling disc and the fourth milling disc which are arranged in parallel, has high stirring speed and an obvious effect, improves the quality of aggregate mixtures and shortens the processing time. In addition, nylon integrated formation is adopted, so the milling device of the coating milling machine is long in life. The milling device of the coating milling machine is simple in structure, durable and strong in practicability.