本发明公开了一种减少邻甲基-N-乙酰乙酰苯胺生产中副产物的方法,在反应容器中加入酒精,搅拌,在0~30℃下同时滴加双乙烯酮和邻甲苯胺,反应温度为10~50℃,滴加结束后,反应保温1~5小时后冷却至10℃以下过滤,烘干,得到邻甲基-N-乙酰乙酰苯胺成品;在过滤得到的酒精滤液中加入酸性催化剂,邻甲苯胺:酸性催化剂的质量比为1: The invention discloses a method for reducing the by-product in o-methyl-N-acetoacetanilide production by adding alcohol in a reaction vessel, stirring, simultaneously adding diketene and o-toluidine dropwise at 0-30 DEG C, and the reaction temperature is 10 to 50 DEG C, after the dropwise addition is completed, the reaction is incubated for 1 to 5 hours and then cooled to below 10 DEG C for filtration and dried to obtain the o-methyl-N-acetoacetanilide product; the acidic catalyst is added into the filtered alcohol filtrate, O toluidine: acidic catalyst mass ratio of 1: