Method for preparing acetoguanamine

The invention relates to the chemical field, and concretely relates to a method for preparing acetoguanamine, the method takes dicyandiamide and acetonitrile as raw materials, takes excess acetonitrile and an ammonia liquid, alkali metal, an alkali metal hydroxide or an organic compound of alkali metal are added as a catalyst, thereby acetoguanamine can be prepared under the temperature of 80-130 DEG C and the pressure of 0.5-6MPa. A system of the excess acetonitrile and the ammonia liquid is beneficial for reducing the pressure under the reaction working condition; enables solvent separation, recovery and reutilization after the reaction is finished; avoids the equipment blockage and crude product blockage, and is beneficial for refining process of the crude product. The excess acetonitrile which is taken as the raw material is capable of effectively increasing the conversion rate of dicyandiamide. The excess acetonitrile which is taken as the raw material is capable of increasing the reaction rate, and the