The invention relates to a grinder cooling system. The grinder cooling system comprises a first pump, a first magnetic separator, a water tank, a second magnetic separator, a water supply box, a water returning box and a second pump which are sequentially in pipeline connection. The grinder cooling system has the beneficial effects that impurities in cooling water are reduced, and water in the water returning box becomes clean; and partition plates strewn at random are arranged in the two water boxes, the flowing time of the cooling water in the water boxes becomes longer so that sufficient cooling can be achieved, and that is to say temperature is lowered.