The cutting filtrate machine separates oil impurities with a strong magnetic separator used for purifying coolant (chip oil or emulsion) for grinding machines and other machine tools. By using the magnetic drum of the separator to extract iron filings from the coolant, the coolant is kept clean. The use of magnetic separators can reduce the number of grinding wheel corrections, improve the surface smoothness of workpieces, and extend the service life of grinding wheels and coolant. In grinding, with the improvement of machining accuracy, high-speed grinding and strong grinding technologies have developed rapidly. In addition to selecting reasonable grinding parameters, it is also necessary to improve the circulation quality of grinding fluid. Purification devices are divided into two types: filtration type and power type.