In this work, we study the photoconductivity parameters of Co3O4–ZnO thin films formed on polycortex substrates. Co3O4–ZnO nanocomposite films were deposited on substrates by solid-phase pyrolysis with a Co:Zn molar ratio of 10:90, 5:95, 3:97, and 1:99 and annealed at a temperature of 600 °C. The film thickness was 150–200 nm. The crystal structure of the films was studied, and the SEM images were analyzed. After application of contact metallization, the parameters of photoconductivity were measured under the action of light from an LED with a wavelength of 400 nm.