Grinding assembly of stone polishing equipment

The utility model discloses a grinding assembly of stone polishing equipment. The grinding device comprises a mounting frame, a plurality of grinding disc assemblies and a plurality of driving units corresponding to the grinding disc assemblies, the plurality of millstone assemblies are mounted on the mounting frame; the millstone assembly comprises a mounting seat fixed on the mounting frame, a main shaft which is connected into the mounting seat in a penetrating manner and is in pivot fit with the mounting seat, and a millstone fixedly connected to the lower end part of the main shaft; the connecting seat is mounted at the top end of the main shaft and pivotally matched with the main shaft; a cylinder body of the driving cylinder is fixed to the mounting frame, the telescopic rod is connected to the connecting base, the driving unit is used for driving the main shaft to rotate, an electronic ruler is further arranged between the connecting base and the mounting frame, the top end ofthe electronic ruler is h