Preparation method for one-pot synthesis of 5,6-dinitrobenzimidazolone

The invention relates to a preparation method for one-pot synthesis of 5,6-dinitrobenzimidazolone; the method adopts a solid super acid and an ionic liquid commonly as a catalyst, and effectively prepares 5,6-dinitrobenzimidazolone with high yield. Compared with a two-step method in the prior art, the method provided by the invention has the advantages that the reaction steps are saved, reaction conditions in the reaction are mild, the reaction time is greatly shortened, the reaction temperature is obviously decreased, energy sources are facilitated to be saved, and costs are cut down.