Improved coating grinder

The utility model provides an improved coating grinder for preventing coating grains from being overstocked at a certain position in the grinding process. The improved coating grinder comprises a grinding box body and a feeding hopper, wherein the feeding hopper is arranged at the upper part of the grinding box body; the lower part of the feeding hopper extends into the grinding box body; a discharge opening is formed in the lower part of the feeding hopper; the cross section of the lower part of the feeding hopper is gradually reduced from top to bottom; a crushing device is also positioned below the feeding hopper in the grinding box and comprises a pair of rolling shafts which can relatively rotate and is arranged in the box body in a penetrating way; the surfaces of the two rolling shafts are respectively wound with spiral cutters in the axial direction; the two spiral cutters are mutually connected in a meshing way; a cleaning shaft is arranged on the outer side of the lower surface of the circumference of each rolling shaft; each cleaning shaft and the corresponding rolling shaft do relative rotation; the outer surface of each cleaning shaft is wound with a spiral brush body which can be used for cleaning coating adhering to each rolling shaft; each spiral brush body and the corresponding spiral cutter are connected in an occluding way; a fine powder outlet is formed in one side of the lower part of the grinding box body.