The invention discloses a method of preparing a perovskite-based light-transmitting solar concentrator by using titanium dioxide, which comprises the following steps of: 1) preparing a perovskite precursor solution, 2) preparing perovskite nanocrystals, 3) preparing a solar concentrator: adding a small amount of CsPbBr3 nanocrystals, nano titanium dioxide and a photoinitiator into methyl methacrylate and performing ultrasonic treatment for uniform dispersion, pouring the mixture to a mold, performing polymerization under ultraviolet irradiation, opening the mold after polymerization is completed and acquiring the light-transmitting solar concentrator after cutting and polishing. The method is simple to operate and low in operation process difficulty, and the performance of the solar concentrator containing the lead-based perovskite can be improved.