Disclosed is a perovskite precursor solution for improving stability of a perovskite solar cell, comprising: adding ioformamidine and cesium iodide into a solvent, adding bromomethylamine after stirring, adding lead iodide and 3,4-dichloroaniline after stirring, and obtaining the perovskite precursor solution for improving the stability of the perovskite solar cell by stirring; and spin-coating the perovskite precursor solution for improving the stability of the perovskite solar cell on a substrate, and obtaining a perovskite thin film by means of thermal annealing as a light absorption layer of the solar cell. The perovskite precursor solution for improving the stability of the perovskite solar cell prepared by the present invention replaces an existing perovskite layer, the defects in the existing perovskite mineralization technology are solved, and provided is a perovskite stability improvement means that has low requirements for the process environment, is convenient in preparation method, can realize the long-time stable performance in a common environment and is used for the cell preparation process.
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