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In the title polymer, {[Co(C14H10N2O4)(H2O)]·3.5H2O}n, the Co2+ ion is coordinated by three carboxylate O atoms from two 5-[(pyridin-2-ylmethyl)amino]isophthalate anions, two N atoms from a (pyridin-2-ylmethyl)amino group and an O atom from a water molecule, furnishing a distorted CoO4N2 octahedral geometry. Each anion acts as a μ3-bridge, linking cobalt ions into a two-dimensional layer parallel to (100). The asymmetric unit also contains three and a half solvent water molecules, which could not be modeled. Therefore, the diffraction contribution of the solvent water molecules was removed by the subroutine SQUEEZE in PLATON [Spek (2009). Acta Cryst. D65, 148–155]. The crystal structure is stabilized by O—H...O hydrogen bonds in which the coordinated water molecule acts as donor and the carboxylate O atoms as acceptors.