The invention discloses a method for preparing borate esters on the basis of an anilino lithium compound. According to the method, a catalyst, borane and aromatic carboxylic acid are stirred and mixeduniformly in sequence, reaction is carried out for 35 to 45 minutes, the mixture is exposed to the air to terminate the reaction, and the reaction liquid is decompressed to remove the solvent so as to obtain the borate esters with different substituents. The anilino lithium compound disclosed by the invention can catalyze the hydroboration reaction of carboxylic acid and borane with high activityat room temperature; the amount of the catalyst is only 0.8 mol% of the molar amount of the carboxylic acid; and compared with the existing catalytic systems, the method utilizes the commercial reagent aniline lithium compound, so that the reaction conditions are mild, and the yields of the borate esters with different substituents under defined conditions can be up to 99%.