The low-cost, high-efficiency and easy fabrication of perovskite solar cells make them an ideal candidate for replacing industrialized silicon solar cells, and thus reforming the current energy supply structure. However, the industrialization of perovskite solar cells is now restricted due to its poor stability. In this article, the intrinsic ion migration behavior in the perovskite film under light irradiation is introduced, which is mainly responsible for hysteresis, fluorescence quenching/enhancement and the failure of solar cell. In addition, the typical ultraviolet light instability of TiO₂/perovskite interface, and the light instability of hole transport layer and metal electrodes are also discussed subsequently. As a light-dependent device, improving its light radiation stability is essential for making it suitable to various environmental applications.