Magnetic filter transport process, the liquid through the filter, by the magnetic role of strong magnet, slurry in the iron impurities are adsorbed on the magnet casing, greatly reduce the liquid slurry of iron impurities, to ensure that the next process can effectively control the content of iron impurities. Magnetic filters are widely used in medical, health, textile, machinery, circulating water, pigments, dyes, petrochemical, pharmaceutical, food, plastics, food and other industries, in the liquid slurry transport process to effectively remove iron impurities, reduce the iron ions in the product content, improve product quality. It has the advantages of small size, light weight, convenient installation and operation. The magnetic filter is composed of a strong magnetic material with high coercivity and a blocking filter, the adsorption force is 10 times times of the general magnetic material, has the ability to adsorb the micro-grade ferromagnetic pollutant under the instantaneous liquid flow impact or the high flow rate state, and can overcome the ferromagnetic pollutant which flushes under the high speed big impact to be absorbed again, Thus avoid the hydraulic components of the card die or friction pay wear, extend the hydraulic components and hydraulic system service life, enhance the reliability of the hydraulic system.