Perovskite solar cells single-doped with Br- or Cs+ ions have been proved to be an effective approach to improve their efficiency and stability. In our work, we took advantage of co-doping with Br- and Cs+. At our studied doping levels from CH3NH3I:PbI2:CsBr = 1:1:0 (x = 0) to 0.85:1:0.15 (x = 0.15), CsBr doping does not introduce any detectable impurity, and the crystal grains grow larger with increasing CsBr doping level. Furthermore, when the CsBr doping level is less than x = 0.1, it can progressively enhance the optical absorption of the perovskite film, although the absorption begins to decrease when the doping level rises above x = 0.1. X-ray photoelectron spectroscopy measurements show that Br- has successfully replaced I- and bonds with Pb2+ after CsBr doping. At the optimized doping level of x = 0.1, the incorporation of CsBr in the reaction system can improve the morphology of perovskite films and greatly enhance the efficiency from 9.8% for undoped sample to 13.6%, better than single Br- or Cs+ doping. Our result shows that CsBr doping is an effective method to enhance the efficiency of perovskite solar cells.