The invention relates to a coating dispersion grinding miller. The coating dispersion grinding miller comprises a base, wherein the left side of the base is provided with a hydraulic pump station, the right side of the base is provided with a pump I, the middle of the base is provided with a hydraulic cylinder, a radial arm is arranged on the top of the hydraulic cylinder, and a power device is arranged above a cantilever; the upper and lower surfaces of the right end of the radial arm are respectively provided with a bearing I and a bearing II, the bearing I is internally provided with a positioning shaft, and a coupler is connected below the positioning shaft; a dispersion device is arranged below the right end of the cantilever, a dispersing device comprises a rotating shaft, a hydraulic motor I, a gear box body, a bevel gear wheel, a bearing, a bevel gear shaft, two bevel pinions and two fixed sleeves; the upper part of the dispersion device is fixedly provided with a conversion valve, and a grinding barrel is arranged on the outer side of the dispersing device. The coating dispersion grinding miller provided by the invention has the advantages that the structure is reasonable, the dispersion efficiency is high, the grinding effect is obvious, the operation is convenient, and a condition that the dispersion and the grinding are simultaneously performed is realized.