A new method for preparing high-quality perovskite films using dispersed nano-silica in chlorobenzene as the anti-solvent was introduced in this article. By dispersing nano-silica in the anti-solvent chlorobenzene， nucleation and crystal growth were controlled， ultimately enhancing the overall device performance of perovskite solar cells. The optimized perovskite films had uniform and flat surfaces with high densities， as well as the significantly extended carrier lifetime of 2 386.5 ns. The device had an increased built-in electric field of 1 143.2 mV， an optimum device photoelectric conversion efficiency of 20.6%， and an increased fill factor of 76.6%.