The invention discloses a method for purifying N-methyl pyrrolidone and gamma-butyrolactone, which comprises the following steps of: making a reagent to be purified pass through a polystyrene-divinylbenzene type nonpolar macroporous resin column, filtering by using a charged cellulose membrane, and performing rough filtration and fine filtration on filtrate in turn by using polytetrafluoroethylene filters in different dimensions. The method has the advantages of simple process, easily controlled conditions, low energy consumption, no rigorous requirement on power equipment, no need of special temperature control conditions and effective production under conventional temperature, and is used for recovering and purifying the N-methyl pyrrolidone and the gamma-butyrolactone, and the purity of the obtained reagent can reach an electron level; meanwhile, materials such as the macroporous resin can be used as fuel to be reutilized, and are light in environmental pollution; and the process has a larger application space and good market prospect.