The invention relates to a circulation filtration system of a mold cleaning fluid. The circulation filtration system comprises the cleaning fluid used for cleaning, a cleaning chamber pit, submerged pumps, a clarification tank, a receiving tank, a fine filter and a dosing tank, wherein the submerged pumps comprise a first submerged pump and a second submerged pump and are arranged in the cleaning chamber pit; the clarification tank is used for receiving fluids discharged from the submerged pumps for rough filtration; the receiving tank is used for receiving the cleaning fluid roughly filtered by the clarification tank; the fine filter is connected with the receiving tank through a centrifugal pump; the cleaning fluid is recycled after filtered by the fine filter; the dosing tank is used for receiving the filtered cleaning fluid and a newly proportioned cleaning fluid; a waste fluid fixed-point discharge port is formed in the lower part of the dosing tank; and waste fluid is discharged into the cleaning chamber pit through a floor drain and is pumped into a sewage treatment system by the second submerged pump.