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This invention discloses a method for preparing aryl carboxylic acids by reacting aryl thioonium salts with carbon dioxide using a copper compound as a catalyst and diethylzinc as a reducing agent. The aryl thioonium salt substrate is reacted with an organic solvent at room temperature under a carbon dioxide atmosphere at one atmosphere. The product is then acidified and purified to obtain the aryl carboxylic acid. This method uses readily available raw materials, is simple to operate, operates under mild conditions, and exhibits good functional group tolerance and substrate versatility. This method can not only synthesize various simply substituted aryl carboxylic acids but can also be used for the late-stage carboxylation modification of complex drug molecules. The practicality of this method has also been verified on a gram-scale, demonstrating promising prospects for industrial application.