The present invention relates to a resin composition for a redox flow battery separator, and a method for producing a redox flow battery separator using same. The resin composition comprises: a polyolefin-based resin; a fumed silica; a compatibilizing agent including at least one selected from the group consisting of a maleic anhydride graft-polyethylene, a maleic acid graft-polyethylene, an alkyl maleate graft-polyethylene, a maleamic acid graft-polyethylene, and polyethylene oxide; and a pore former.
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