N, o- dimethyl -n'- nitroisourea preparation

The present invention discloses a N, O- dimethyl -N'- nitroisourea preparation, using O- methyl -N- nitroisourea, methylamine hydrochloride as raw materials for water the solvent, potassium fluoride - water system reaction, a chemical reaction is as follows: the present invention process is simple, easy to operate, with water as a solvent, and does not need to adjust the pH of a catalyst, can effectively inhibit the formation of side reactions. Product purity is over 99%, and the yield was 79.1%, suitable for industrial production.