Preparation method of m-nitrobenzotrifluoride

The invention discloses a preparation method of m-nitrobenzotrifluoride. The method comprises the following steps: S1, carrying out first nitration reaction on a reaction liquid material A in a first reaction kettle to obtain a reaction liquid material B; the reaction liquid material A comprises benzotrifluoride, nitric acid and concentrated sulfuric acid; the volume ratio of trifluorotoluene to concentrated sulfuric acid is 1: 4; the nitration temperature of the first nitration reaction is 40-50 DEG C; s2, the reaction liquid material B obtained in the step S1 is subjected to a second nitration reaction in a second reaction kettle, and a reaction liquid material C is obtained; the nitration temperature of the second nitration reaction is 50-60 DEG C; s3, the reaction liquid material C obtained in the step S2 is subjected to a third nitration reaction in a third reaction kettle, and a material D is obtained; the nitration temperature of the third nitration reaction is 60-70 DEG C. The preparation method provi