Chelating resins are polymer compounds that selectively chelate specific metal ions in the form of ionic bonds or coordination bonds in a solution containing metal ions. The resin is composed of crosslinked polymers (such as styrene/two ethylene benzene resin) and is connected with a special functional base.

It belongs to functional polymers. Chelating resins are generally made by polymer chemical reactions, and monomers containing ligand bases can also be polymerized or copolymerization to form resins containing ligand bases in the main chain or side chain of polymers.