An apparatus for deposition of 31igh-temperature superconducting thin films in the Y-Ba-Cu-O, Bi-Sr-Ca-Cu-O and Ti-Ba-Ca-Cu-O systems by metal-organic chemical vapour deposition (MOCVD) is presented. The reliability of the apparatus was verified by deposition and characterization of the CuO, Cu-Sr-O and Bi-Sr-Ca-Cu-O thin films. The apparatus will be used for preparation and study of Y-, Bi- and Tl-based oxide superconductor thin films.