Perovskite solar cells have attracted increasing attention due to the possibility of flexible devices compared with silicon-based photovoltaic cells and high energy conversion efficiencies compared with organic photovoltaic cells. Although they have been widely explored in recent years, elastic perovskite solar cells, for the first time, have been realized here by designing a stretchable nanostructured fiber and spring-like modified Ti wire as two electrodes with perovskite materials coated on the modified Ti wire based on a solution process. The elastic perovskite solar cell appears in a fiber format and maintains stable energy conversion efficiencies under stretching.