将聚乙烯吡咯烷酮（PVP）与聚(乙烯-乙烯醇)（EVAL）共混，采用浸没沉淀法制备了PVP/EVAL共混膜，并用于油水乳液分离过程。通过全反射红外光谱、扫描电子显微镜、拉伸试验、接触角测试等对膜的组成、结构形态、机械性能、亲水性进行了表征，并研究了PVP添加量对共混膜油水分离性能的影响。结果表明：添加PVP能较显著地改变EVAL膜的结构，且共混膜的机械强度和亲水性得到明显改善，当PVP添加量为10 wt%（PVP在铸膜液中的质量分数）时，其拉伸强度和断裂伸长率分别为纯EVAL膜的1.88 倍和1.34 倍。当PVP 添加量为4 wt%时，油水分离稳定通量为纯EVAL 膜的1.81 倍，截留率为92.2 %，比纯EVAL 膜略高。PVP 添加量为10 wt%的PVP/EVAL 共混膜清洗后通量恢复率由纯EVAL 膜的51 %增至77.98 %。

PVP/EVAL blend membranes was prepared by blending of PVP with poly(ethylene-co-vinyl alcohol) (EVAL) via immersion precipitation and were used to separate the oil/water emulsion. The chemical structure, morphology, mechanical performance and hydrophilicity of PVP/EVAL blend membranes were characterized by FTIR-ATR, scanning electron microscopy, tension test and water contact angle measurement. The effect of PVP content on the separation performance of oil/water emulsion was investigated. The results indicate that PVP content had distinct effect on the morphology of PVP/EVAL membranes. The tensile strength and elongation at break of PVP/EVAL blend membrane with 10 wt% (the mass percent of PVP in the casting solution) PVP were 1.88 and 1.34 times, respectively, that of pure EVAL membrane. When the content of PVP increased to 4 wt%, oil/water emulsion flux of PVP/EVAL blend membrane were 1.81 times that of the pure EVAL membrane. The rejection ratio was 92.2 %, slightly higher than the pure EVAL membranes. When the content of PVP increased to 10 wt%, the flux recovery ratio after washing increased from 51 % to 77.98 %.