The all-solution-processed fabrication of inverted perovskite solar cells is one of the key development trends in perovskite photovoltaics. However, the poor compactness and low electrical conductivity of solution-processed nickel oxide layers have become bottlenecks restricting the large-area fabrication and efficiency improvement of such devices. To address this issues, this paper proposes a method for preparing nickel oxide and inverted perovskite solar cells based on AlCl₃ doping. By incorporating aluminum chloride into the nickel oxide precursor solution, not only can the compactness of the nickel oxide layer be improved, but its electrical conductivity can also be increased. Moreover, this doping strategy promotes the growth of high-quality perovskite films and reduces non-radiative recombination at the nickel oxide/perovskite interface. The fabricated inverted perovskite solar cell prepared via the full-solution method with AlCl₃ doping achieved a power conversion efficiency of 24.76%. This work provides a new strategy for the preparation of large-area, high-efficiency inverted perovskite solar cells through full-solution processing.