The area of organic-inorganic hybrid perovskite has undergone especially intense research and transformation over the past seven years. Although most of the focus is on achieving high power efficiencies (>20%) on rigid substrates by solution process, the flexible version has not been neglected and has also gone through vast improvements in terms of efficiencies and durability. In this review paper, the most recent three years' developments in flexible perovskite solar cells are covered, showcasing the key of strategies used to transform these cells from rigid to flexible. Future outlook will be presented at the end exhibiting the potential problems that need to be solved in order to send these novel flexible power generators into the future market.