Combined cast iron grinding disc

The utility model discloses a combined cast iron grinding disc which comprises a grinding disc mounting seat and a fixing hole, a grinding ring is arranged on the surface of the top of the grinding disc mounting seat, and the grinding ring is composed of a plurality of groups of first grinding disc blocks and second grinding disc blocks. According to the cast iron grinding device, the grinding head and the grinding plate are adopted, in the actual using process, a worker can select to use the grinding head or the grinding plate to conduct grinding operation according to different sizes of cast iron raw materials needing to be processed and different grinding procedures, the overall grinding effect can be obviously improved, the grinding device is not limited to a single grinding structure any more, and the grinding efficiency is improved. The grinding device is simple in structure and convenient for personnel to use, only the grinding head or the grinding plate needs to be replaced when the grinding device is