Metal–Organic Frameworks (MOFs), which are highly porous materials, offer significant potential across multiple energy storage domains, notably within redox flow batteries (RFBs). Over the past decade, MOFs have garnered increasing attention as advanced electrode and separator materials in RFBs. The advancement of non-aqueous redox flow batteries (NARFBs) remains significantly constrained by the absence of membranes with sufficient ionic selectivity and chemical compatibility. Herein, we fabricated flexible membranes incorporating metal–organic framework (MOF) via a solution casting.