The recycling of used cooking oil is an effective approach for reducing environmental pollution and supporting the circular economy. This study aims to prepare sustainable and environmentally friendly smart polymers from waste cooking oil through epoxidation of the unsaturated bonds followed by polymerization/cross-linking reactions. The prepared polymer was characterized using FTIR, ¹H-NMR, and SEM analyses. The results confirmed the successful chemical modification of the oil and the formation of ester/ether-containing polymeric structures with a porous and interconnected morphology. The prepared polymer showed promising smart-responsive characteristics due to the presence of dynamic bonds and flexible fatty acid chains. These properties make the material suitable for potential applications in smart packaging, filtration, adsorption, and controlled release systems.