Ion exchange of industrial filter cloth is a separation method based on the exchange between exchangeable ions on ion exchanger and ions in liquid phase. Synthetic ion exchange resins are widely used as ion exchangers. They are insoluble polymer electrolytes with network structure and ionizable active groups. According to the different active groups on the resin skeleton, it can be divided into cation exchange resin, anion exchange resin, amphoteric ion exchange resin, chelating resin and redox resin. Resins used for ion exchange separation require insolubility, certain degree of crosslinking and swelling, and high exchange capacity and stability.