NOVELTY - A rebamipide is prepared by taking amino acid as raw material, adding raw material in purification vessel and adding alkaline water, raising temperature to 55-70 degrees C under alkaline condition, adding active carbon to solution, dissolving and filtering; adsorbing and decoloring, filtering, Adding reagent, dropping p-chloro benzoyl chloride and mixed solution of alcohol and stirring; reacting to obtained solution, filtering solution, dissolving transition body, adding acid and continuing to stir; and after solution crystallization, and filtering to obtain filtrate cake solid.    USE - Method for preparing rebamipide (claimed).    ADVANTAGE - The method is carried out in one step, prepares rebamipide with high purity, and is suitable for large-scale production mode. The yield of rebamipide product is improved, where only few impurities are generated. The environment pollution is small and production cost is lowered.    DETAILED DESCRIPTION - Rebamipide is prepared by:    (A) taking amino acid as raw material, adding raw material in purification vessel and adding alkaline water, raising temperature to 55-70 degrees C under alkaline condition, adding active carbon to solution, dissolving and filtering;    (B) adsorbing and decoloring to obtain raw material amino acid and filtering solution at 0-15 degrees C;    (C) adding reagent, dropping p-chloro benzoyl chloride and mixed solution of alcohol and stirring raw material amino acid filter liquid for 1.5-2.5 hours;    (D) reacting to obtained solution for 1.5-2.5 hours;    (E) filtering solution, and obtaining alkali salt compound as transition body;    (F) dissolving transition body in purified water, and keeping temperature of solution at 18-22 degrees C;    (G) adding acid to make pH value of solution reaches 2-4, and continuing to stir for 2 hours;    (H) after solution crystallization, and filtering to obtain filtrate cake solid;    (I) repeatedly washing filter cake solid with hot water and ethanol, and making pH value reaches 7; and    (J) filtering and drying to obtain end product rebamipide.