A procedure has been developed for the intercalation of pyrrole into nanocavities of a metal-organic coordination polymer, chromium terephthalate MIL-101, and oxidative polymerization of pyrrole has been accomplished. The new composite nanomaterial thus obtained, polypyrrole@MIL-101, has been characterized by the data of elemental analysis, X-ray powder diffraction, thermal analysis, and scanning electron microscopy. Its specific surface area has been estimated at 1700 m/g according to Brunauer-Emmett-Teller.