The present invention, while maintaining the characteristics of the ultrafiltration membrane prepared by the phase transfer method, the mechanical strength is excellent ultrafiltration membrane and is related to a method of manufacturing the same. ; as a structure consisting of a porous layer is an ultrafiltration membrane is no macropores in the asymmetric membrane is formed in the thickness of the surface layer and the surface layer lower part in the form of spherical particles having a gradual increase in pore size depending on the location of the present invention, Due to the asymmetrical surface layer, the long term, reducing loss of mechanical strength and can improve the stain resistance, due to the porous layer formed in the lower form of spherical particles, can also meet the permeability and the mechanical strength at the same time. In particular, the present invention through the change, such as feed rate, temperature of the solution temperature and humidity conditions, the support in the air gap, it is possible to manufacture the ultrafiltration membrane, the production method of the present invention is simple manufacture without additional stretching process, such as The pitcher without significant reduction in the cost of the process and provides excellent rejection ultrafiltration membrane and, moreover, as jungchok excellent mechanical strength, advanced water treatment, useful for the next generation of highly efficient separation process industries including water treatment process that is being increasingly stringent it may be utilized.
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