ZnO is an excellent material for the electron transport layer (ETL) of perovskite solar cells (PSCs), but the interface between ZnO and perovskite absorption layer has great thermal instability, resulting in serious charge recombination at the interface. In this paper, ZnO nanorod arrays (NAs) with good orientation were prepared on FTO conductive glass by hydrothermal method. By adjusting the electrodeposition time, a layer of CuO nanoparticles was electrodeposited on ZnO NAs, and ZnO@CuO nanocomposites were obtained. The morphology and phase of the composite films were observed and analyzed by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD). The optical properties were measured by UV-visible diffuse reflectance (UV-vis DRS) and transient fluorescence spectroscopy (PL). The results show that ZnO NAs is uniform with good perpendicularity, and the diameter is about 120 nm; After electrochemical deposition of CuO nanoparticles (size between 34 nm and 44 nm), the ultraviolet and visible light absorption capacity of the composite film is enhanced, and the carrier separation efficiency is improved. When the electrodeposition time is 40s, ZnO@CuO NAs have the largest photocurrent density which is about 3.37 times that of the photocurrent density of ZnO NAs, showing good photoelectric conversion performance.