This article presents the development of hygro-responsive membranes for efficient oil-water separation. The membranes are superhydrophilic and superoleophobic in both air and water, enabling the separation of various oil-water mixtures with over 99.9% efficiency using gravity-driven capillary forces. The membranes are designed to overcome the limitations of traditional membrane technologies, which are often energy-intensive and prone to fouling. The membranes are fabricated using a blend of fluorodecyl polyhedral oligomeric silsesquioxane (POSS) and cross-linked poly(ethylene glycol) diacrylate (x-PEGDA), resulting in surfaces with tunable wettability. The membranes can separate surfactant-stabilized emulsions, free oil and water, and complex mixtures with high efficiency. The separation process is continuous and self-repairing, with the ability to operate for over 100 hours without a decrease in flux. The membranes show excellent performance in separating both oil-in-water and water-in-oil emulsions, as well as free oil and water. The study highlights the potential of these membranes for applications such as oil spill cleanup, wastewater treatment, fuel purification, and the separation of commercially relevant emulsions. The membranes are also shown to be highly resistant to fouling, making them suitable for continuous operation. The research demonstrates a novel approach to oil-water separation using gravity-driven capillary forces, offering a promising solution for energy-efficient and cost-effective separation technologies.This article presents the development of hygro-responsive membranes for efficient oil-water separation. The membranes are superhydrophilic and superoleophobic in both air and water, enabling the separation of various oil-water mixtures with over 99.9% efficiency using gravity-driven capillary forces. The membranes are designed to overcome the limitations of traditional membrane technologies, which are often energy-intensive and prone to fouling. The membranes are fabricated using a blend of fluorodecyl polyhedral oligomeric silsesquioxane (POSS) and cross-linked poly(ethylene glycol) diacrylate (x-PEGDA), resulting in surfaces with tunable wettability. The membranes can separate surfactant-stabilized emulsions, free oil and water, and complex mixtures with high efficiency. The separation process is continuous and self-repairing, with the ability to operate for over 100 hours without a decrease in flux. The membranes show excellent performance in separating both oil-in-water and water-in-oil emulsions, as well as free oil and water. The study highlights the potential of these membranes for applications such as oil spill cleanup, wastewater treatment, fuel purification, and the separation of commercially relevant emulsions. The membranes are also shown to be highly resistant to fouling, making them suitable for continuous operation. The research demonstrates a novel approach to oil-water separation using gravity-driven capillary forces, offering a promising solution for energy-efficient and cost-effective separation technologies.