NOVELTY - 2-Chloronicotinic acid and 2-methyl-3-trifluoromethylaniline are added to aqueous sodium hydroxide solution, toluene and phase-transfer catalyst are added and reacted. The resultant reaction solution is maintained, aqueous layer is separated, pH is adjusted to 5-6, filtered, the filter cake is washed and dried, to obtain flunixin. Flunixin and N-methylglucamine are mixed, reacted in isopropanol, the resultant reaction mixture is filtered, cooled to 50-60 degrees C, crystallized, the resultant crystals are subjected to suction filtration and washed with isopropanol, to obtain flunixin meglumine.    USE - Preparation of flunixin meglumine (claimed).    ADVANTAGE - The method provides flunixin meglumine by economical process in short period of time at low reaction temperature, with reduced energy consumption.    DETAILED DESCRIPTION - 2-Chloronicotinic acid and 2-methyl-3-trifluoromethylaniline are added to aqueous sodium hydroxide solution, stirred uniformly, toluene and phase-transfer catalyst are added, pH of the resultant solution is adjusted to 10-11 and reacted at 40-45 degrees C for 4-5 hours. The resultant reaction solution is maintained, aqueous layer is separated, pH is adjusted to 5-6, filtered, the filter cake is washed and dried, to obtain flunixin. The obtained flunixin and N-methylglucamine are mixed, reacted in isopropanol for 0.5-1.5 hours, filtered, cooled to 50-60 degrees C, temperature of the solution is reduced to less than 25 degrees C, stirred for 1 hour, crystallized, the resultant crystals are subjected to suction filtration and washed with isopropanol, to obtain flunixin meglumine. The molar ratio of 2-chloronicotinic acid and 2-methyl-3-trifluoromethylaniline is 1:1.05-1:1. The molar ratio of 2-chloronicotinic acid and aqueous sodium hydroxide solution is 1:1. The mass-volume ratio of 2-chloronicotinic acid and water is 1:6-10. The volume ratio of water and toluene is 1:1. The phase-transfer catalyst is benzyl chloride and/or triethylamine. The usage amount of 2-chloronicotinic acid is 0.5-1 wt.%. The molar ratio of flunixin and N-methylglucamine is 1:1.02-1.20. The volume ratio of flunixin and isopropanol is 1:5-7.