The invention provides a production process of tricyclazole, and belongs to the field of pesticide production. The method solves the problems that the utilization rate of formic acid is low in the prior art; the production process of tricyclazole comprises the following steps of S01, putting 30-35% of reaction formic acid into 4-methyl-2-hydrazino benzothiazole, heating to 105-110 DEG C and performing reflux reaction for 2-5h; and S02, after reflux reaction is ended, carrying out reduced pressure distillation, evaporating out and recovering formic acid, wherein the temperature of reduced pressure distillation is 130-160 DEG C; dropwise adding water into the reduced pressure distillation residue, wherein the dropwise adding speed is 30 drops/min to 60 drops/min; carrying out cooling and crystallizing after dropping, wherein the temperature of the cooling crystallization is minus 10 DEG C to 40 DEG C; performing filtering, and then drying on filter cake obtained by filtering at 50-100 DEG C to obtain a tricyrazole crude product; and carrying out refining on the tricyrazole crude product obtained in the step S02 by an ethyl acetate-ethyl alcohol mixed solvent to obtain refined tricyclazole. The method disclosed by the invention is high in yield of the tricyclazole.