To provide a method for manufacturing a poly-m-phenylene isophthalamide separation membrane which shows excellent membrane formation properties and besides, superb permeability to water and high temperature water vapor, when the separation membrane is manufactured using a stock solution for forming a poly-m-phenylene isophthalamide membrane containing an inorganic salt as an additive by a low temperature solution polycondensation process.

The poly-m-phenylene isophthalamide separation membrane is manufactured by extruding the stock solution for forming a poly-m-phenylene isophthalamide membrane containing the inorganic salt and a water-soluble polymer by the low temperature solution polycondensation process into a coagulating bath under heating conditions at 70°C or higher and coagulating the stock solution.