NOVELTY - An organic solvent, amine base and cyanobenzyl halide are added to reactor, stirred, dissolved and ammonolyzed, to obtain cyanobenzyl halide solution. Methenamine and water are added to another reactor, stirred, dissolved and ammonia is added to cyanobenzyl halide solution, reacted, cooled and hydrolyzed. Cyanobenzyl halide and acid are hydrolyzed, and water is added to reactor, stirred, heated and liquid separated. The lower layer of acidic water is added to another reactor, heated, stirred, cooled, precipitated, neutralized and filtered, to obtain aminomethylbenzoic acid.    USE - Preparation of aminomethylbenzoic acid (claimed).    ADVANTAGE - The method enables preparation of aminomethylbenzoic acid with high yield and quality by economical and environmentally-friendly method within short period of time.    DETAILED DESCRIPTION - An organic solvent, amine base and cyanobenzyl halide are added to reactor, stirred at room temperature, dissolved and ammonolyzed, to obtain cyanobenzyl halide solution. Methenamine and water are added to another reactor, stirred at room temperature, dissolved, processed in ice-salt bath, and internal temperature is decreased to 5 degrees C and ammonia is added to cyanobenzyl halide solution. The internal temperature is reduced to less than 15 degrees C. The mixture is reacted and stirred at 10-80 degrees C for 5-6 hours. After completion of reaction, the mixture is cooled to room temperature, maintained still, liquid separated, and layer of ammonia is removed. The organic solvent layer is directly acid hydrolyzed. Cyanobenzyl halide and acid are hydrolyzed, and water is added to reactor, stirred, heated at 80 degrees C, maintained still and liquid separated. The upper organic solvent layer is recycled. The lower layer of acidic water is added to another reactor, and distilled water is added to reactor, stirred, heated at 120 degrees C for 4 hours, cooled to 90 degrees C, and water is added to mixture, cooled to room temperature, stirred for 1 hour and precipitated. The precipitated solid is filtered, and acidic water layer is provided to next batch. The obtained solid is filtered, and water is added to mixture, stirred for l hour, neutralized, cooled to -5 degrees C, filtered, washed with water and drained, to obtain aminomethylbenzoic acid.