本发明公开了一种乙烯基吡咯烷酮与醋酸乙烯共聚物的制备方法,至少包括步骤:将包括N-乙烯基吡咯烷酮、醋酸乙烯酯及乙醇的反应液加入聚合釜;将反应液充分混合;将偶氮类引发剂加入反应液,用以引发N-乙烯基吡咯烷酮与醋酸乙烯酯的聚合反应;将反应液温度控制在55℃至73℃之间, The invention discloses a preparation method of a copolymer of vinylpyrrolidone and vinyl acetate, at least comprising the steps of: adding a reaction liquid comprising N-vinylpyrrolidone, vinyl acetate and ethanol into a polymerizer; thoroughly mixing the reaction liquid; Nitrogen initiator is added to the reaction solution for initiating the polymerization of N-vinylpyrrolidone and vinyl acetate; the temperature of the reaction solution is controlled to be between 55 ° C. and 73 ° C.,