NOVELTY - Synthetic production of bromethalin is performed by mixing 35-45 g aniline and 100-200 ml ethanol to obtain solution, adding 50-55 g 2-chloro-3,5-dinitro-benzotrifluoride, stirring at room temperature for 10-20 minutes, precipitating, stirring for 25-35 minutes, performing suction filtration to obtain 2,4-nitro-N-phenyl-6-(trifluoromethyl), mixing 200-250 ml dioxane and 60-80 g sodium carbonate, adding 50-60 g 2,4-nitro-N-phenyl-6-(trifluoromethyl), adding dimethyl sulfate, stirring, refluxing for 24 hours, and adding 50-70 ml dimethyl sulfate and 40-60 g sodium carbonate.    USE - Synthetic production of bromethalin (claimed).    ADVANTAGE - Synthetic production process is simple, convenient, safe, reliable, and environment-friendly. Product has high purity.    DETAILED DESCRIPTION - Synthetic production of bromethalin is performed by mixing 35-45 g aniline and 100-200 ml ethanol to obtain solution, adding 50-55 g 2-chloro-3,5-dinitro-benzotrifluoride, stirring at room temperature for 10-20 minutes, precipitating, stirring for 25-35 minutes, performing suction filtration to obtain 2,4-nitro-N-phenyl-6-(trifluoromethyl), mixing 200-250 ml dioxane and 60-80 g sodium carbonate, adding 50-60 g 2,4-nitro-N-phenyl-6-(trifluoromethyl), adding dimethyl sulfate, stirring, refluxing for 24 hours, adding 50-70 ml dimethyl sulfate and 40-60 g sodium carbonate, stirring, refluxing for 2 hours, pouring into water, stirring, performing rested stratification, adding methylene chloride, filtering to obtain N-methyl-2,4-nitro-N-phenyl-6-(difluoromethyl)aniline, stirring 45-55 g N-methyl-2,4-nitro-N-phenyl-6-(difluoromethyl)aniline, dropping 50-70 g bromine, standing for 1 hour, washing with water and sodium hydrogen sulfite, evaporating, washing with methylene chloride, recrystallizing residue with ethanol to obtain N-methyl-2,4-nitro-N-(2,4-dibromophenyl)-6-(trifluoromethyl)aniline, mixing 450-550 ml ether solution and 45-55 g N-methyl-2,4-nitro-N-(2,4-dibromophenyl)-6-(trifluoromethyl)aniline, adding 25-30 g brominated succinimide, stirring, dropping 25-35 ml concentrated sulfuric acid, stirring for 1 hour, diluting with 450-550 ml ethyl ether, filtering, washing with 10% sodium carbonate for 3 times, recrystallizing resulting product with ethanol, sealing, packaging, and storing.