NOVELTY - Preparation of 3-chloro-2-methyl-5-trifluoromethylpyridine comprises mixing glycine ethyl ester hydrochloride and benzophenone with organic solvent in the presence of base and catalyst, reacting at 90-110 degrees C, mixing with diphenylmethylene glycine ethyl ester, 2,3-dichloro-5-(trifluoromethyl)pyridine and organic solvent, reacting at 90-110 degrees C in the presence of second base and second catalyst, reacting with hydrochloric acid at 20-25 degrees C, reacting the resulting product with hydrochloric acid at 90-110 degrees C and carrying out alkali neutralization.    USE - Method for preparing 3-chloro-2-methyl-5-trifluoromethylpyridine (claimed).    ADVANTAGE - The method is environment-friendly, cost-saving and has high yield.    DETAILED DESCRIPTION - Preparation of 3-chloro-2-methyl-5-trifluoromethylpyridine comprises mixing glycine ethyl ester hydrochloride and benzophenone with first organic solvent in the presence of base and catalyst, reacting at 90-110 degrees C, mixing with diphenylmethylene glycine ethyl ester, 2,3-dichloro-5-(trifluoromethyl)pyridine and second organic solvent, reacting at 90-110 degrees C in the presence of second base and second catalyst, reacting with hydrochloric acid at 20-25 degrees C, reacting the resulting product with hydrochloric acid at 90-110 degrees C and carrying out alkali neutralization. The base is trimethylamine, triethylamine, isopropylamine, diisopropylethylamine, propylene diamine, butylamine, aniline, benzylamine and/or dimethylaniline. The catalyst is o-cresol, p-cresol, benzenesulfonic acid, sulfosalicylic acid, p-toluenesulfonic acid, o-methyl salicylate and/or chloro-o-cresol. The second base is sodium hydroxide, sodium carbonate, sodium bicarbonate, potassium hydroxide and/or potassium carbonate. The second catalyst is benzyltriethylammonium chloride, tetraethylammonium bromide, tetrabutylammonium bromide, tetrabutylammonium chloride, tetrabutyl ammonium bisulfate, trioctyl methyl ammonium chloride, dodecyl trimethyl ammonium chloride and/or tetradecyl trimethyl ammonium chloride.