The invention discloses a method for preparing a homogeneous phase
ion exchange membrane. The method comprises the following steps: (1) blending a
functional monomer, a cross-linking agent and an initiator into a uniform solution, thereby obtaining a membrane liquid; (2) soaking a substrate into the membrane liquid to impregnate, taking out the substrate, and clamping between two thin clamps, thereby forming a composite body; (3) enabling the initiator to initialize
polymerization reaction on the composite body at 60-120 DEG C, and peeling off the two thin clamps, thereby obtaining a polymerized membrane; (4) putting the polymerized membrane into a
chlorosulfonic acid chloroform solution for sulfonation treatment, after the sulfonation treatment, soaking in a NaCl solution, after being soaked, washing with water, and
drying, thereby obtaining a Na type cation exchange membrane, or putting the polymerized membrane into a
trimethylamine solution, performing
amination treatment at 20-40 DEG C, after the
amination treatment, soaking in the NaCl solution, after being soaked, washing with water, and
drying, thereby obtaining a Cl type anion exchange membrane. The cation exchange membrane prepared by using the method is low in surface resistance, high in transference number and relatively high in selectivity.