本发明涉及到制备N-乙酰乙酰苯胺的方法。该方法具体步骤包括:在0~10℃内向搅拌的去离子水中加入N-乙酰乙酰苯胺晶种和乳化剂进行反应,然后在一定的温度控制下,同时滴加双乙烯酮和苯胺,并保持温度,反应后,冷却至0℃,过滤,烘干得到N-乙酰乙酰苯胺。本发明方法具有有效防止产品结块,提高产品的外观和性能。提高产品收率,并大幅度降低废水量 The present invention relates to a process for preparing N-acetoacetanilide. The method comprises the following steps of: adding acetoacetanilide seed crystal and emulsifier into stirred deionized water at 0 to 10 DEG C for reaction; then under the control of certain temperature, diketene and aniline are simultaneously added dropwise and the temperature is maintained, After the reaction, the mixture was cooled to 0 ° C, filtered and dried to obtain N-acetoacetanilide. The method of the invention has the advantages of effectively preventing the product from agglomerating and improving the appearance and performance of the product. Improve product yield, and significantly reduce the amount of waste water