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This invention discloses a method for preparing fluorinated aryl ketone compounds and their applications, relating to the field of organic synthesis technology. The method includes the following steps: using fluorinated olefins, benzoyl cyanates, and boric acid compounds as raw materials, and reacting them under visible light irradiation in the presence of a photocatalyst, a base, and an organic solvent to prepare fluorinated aryl ketone compounds. This invention uses fluorinated olefins as the key fluorinated substrate and achieves a multi-component synergistic reaction through visible light catalysis, solving problems such as substrate limitations, poor selectivity, and low yield in existing methods. The prepared fluorinated aryl ketone compounds can be used in the preparation of antibacterial, anti-inflammatory, and anticancer drugs, offering significant economic benefits.