The invention discloses a green preparation method of trimethylhydroquinone, and the preparation method comprises the following steps: adding trimethylhydroquinone diester, alcohol, and acids with a catalytic amount, introducing nitrogen for protection, heating to 60+/-5 DEG C, performing heat preservation for 1.5-2 hours, when the reaction completes, slowly and dropwisely adding water, performing normal-pressure or reduced-pressure distillation to recover the alcohol, when the recovery completes, cooling slowly to 0-10 DEG C, performing heat preservation for 1-2 hours, filtering, washing thefilter cake with water, collecting powder, performing vacuum drying to obtain trimethylhydroquinone. According to the invention, only acids with a catalytic amount is used; under the action of the acids with a catalytic amount, aliphatic alcohol is used for the transesterification of trimethylhydroquinone diester so as to prepare trimethylhydroquinone; the preparation method does not require a lot of high-strength acids or alkalis, and thus not much wastewater is produced, and the environment pollution is less; aliphatic alcohol is used for the transesterification of trimethylhydroquinone diester so as to prepare trimethylhydroquinone, and the used solvents such as aliphatic alcohol and the like can be distilled and recovered; the raw material of trimethylhydroquinone diester is easy to prepare; the requirements for reaction equipment are low; and the production cost is low.