NOVELTY - Preparing dabigatran etexilate comprises condensing 2-(hydroxymethyl)-1H-benzo(d)imidazole-5-carboxylic acid (I) with ethyl 3-(pyridin-2-ylamino)propanoate (II) to obtain ethyl 3-(((2-(hydroxymethyl)-1H-benzimidazol-5-yl)carbonyl)(pyridin-2-yl)amino)propanoate (III), subjecting (III) to Swern oxidation reaction in presence of dimethylsulfoxide and oxalyl chloride to obtain ethyl 3-(((2-formyl-1H-benzimidazol-5-yl)carbonyl)(pyridin-2-yl)amino)propanoate (IV), which is reacted with 4-aminobenzonitrile, then performing methylation reaction using methyl iodide, and then finally reducing.    USE - The method is useful for preparing dabigatran etexilate (claimed).    ADVANTAGE - The method: utilizes easily available raw material and reagent; is economical; does not discharge waste acid during reaction, is environmentally friendly and provide optimal solution for large-scale industrial production of dabigatran etexilate.    DETAILED DESCRIPTION - Preparing dabigatran etexilate comprises (i) condensing 2-(hydroxymethyl)-1H-benzo(d)imidazole-5-carboxylic acid of formula (I) with ethyl 3-(pyridin-2-ylamino)propanoate of formula (II) in presence of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride to obtain ethyl 3-(((2-(hydroxymethyl)-1H-benzimidazol-5-yl)carbonyl)(pyridin-2-yl)amino)propanoate of formula (III), (ii) carrying out Swern oxidation reaction of (III) in presence of dimethylsulfoxide as oxidizing agent and oxalyl chloride under action of organic base at -30 to -78 degrees C to obtain ethyl 3-(((2-formyl-1H-benzimidazol-5-yl)carbonyl)(pyridin-2-yl)amino)propanoate of formula (IV), (iii) reacting (IV) with 4-aminobenzonitrile under acid catalysis to obtain imine intermediate, and then performing methylation reaction using methyl iodide in presence of base to obtain 3-((2-(((Z)-4-cyano-phenylimino)-methyl)-1-methyl-1H-benzoimidazole-5- carbonyl)-pyridin-2-yl-amino)-propionic acid ethyl ester of formula (VI);and (iv) reducing (VI) using reducing agent to obtain 3-((2-((4-cyano-phenylamino)-methyl)-1-methyl-1H-benzoimidazole-5-carbonyl)-pyridin-2-yl-amino)-propionic acid ethyl ester of formula (VII).