The present invention relates to the technical field of photocatalysis, and mainly provides flower-like Bi2MoO6 preparation and applications of flower-like Bi2MoO6 in photocatalytic reduction of CO2. The flower-like Bi2MoO6 is characterized in that bismuth nitrate and sodium molybdate are adopted as raw materials, polyvinyl pyrrolidone is adopted as a morphology modifier, and a hydrothermal method is performed to prepare the Bi2MoO6 photocatalyst, wherein CO2 can be subjected to the catalytic reduction under the visible light condition through the catalyst so as to prepare methanol and ethanol. According to the present invention, the photocatalyst has strong CO2 adsorption capacity and high light quantum efficiency, and has broad application prospects in the fields of promotion of CO2 emission reduction, development of fossil fuel replacing energy sources, efficient utilization of solar energy, and the like.