The present invention relates to a circulating coolant tank purification system. A circulating coolant tank refining system according to an embodiment of the present invention uses a compressed air of an air compressor as a power source to suck coolant containing chips from a coolant tank of a machining center and purify it through filtration. A first filtration device connected to a coolant tank to primarily filter chips in the coolant; A second filtration device that is connected to the first filtration device and the intake port of the air compressor, and receives the coolant in which the chips are first filtered according to the operation of the air compressor, and secondly filters the chips in the coolant; And connected to the outlet of the air compressor to receive a second filtered coolant from a second filtration device, and thirdly filter chips from the coolant through separation and discharge of foreign matter through a cyclone principle, and purify the purified coolant. And a cyclone device for re-supplying the coolant tank.
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