Porous sorbents were prepared from copolymer of acrylonitrile-methylmethacrylate-2-acrylamidomethylpropensulfonic acid and copolymer of acrylonitrile with vinylimidazol. The sorbent obtained from the former copolymer was modified with hydroxylamine, sodium hydroxide, and hydrazinehydrochloride under optimal conditions to obtain amidooxyme, carboxylic, and hydrazide groups. These functional groups introduced in the modified sorbent and the imidazol group in the sorbent of acrylonitrile and vinylimidazol showed high ability to form complexes with heavy metals. The adsorption properties of the porous chelate-forming sorbents obtained were studied with Pb(II) and Cu(II) ions. The order of the polymer sorbents toward sorption of Pb(II) and Cu(II) ions was determined.