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Abstract A green physical route for producing novel multifunctional polyvinyl alcohol/kappa-carrageenan alkaline gel polymer electrolyte is developed, which is based on double-network physical cross-linked hydrogel. The alkaline gel polymer electrolyte has excellent tensile stress (2.22 MPa), stretchability (12.43 mm/mm) and ionic conductivity (0.21 S/cm). In this study, KOH is served as not only ionic donator but also cross-linking agent. A supercapacitor is assembled from polyvinyl alcohol/kappa-carrageenan alkaline gel polymer electrolyte and activated carbon electrodes, which exhibits ideal electrochemistry behavior. The electrode specific capacitance is 470 F/g at 0.5 A/g, and retains above 95% after 2000 charge/discharge cycles. Additionally, the electrochemical performance of supercapacitor under different tensile deformations (≤200%), bending angles (0–230°) and temperatures (≥-40 °C) displays a slightly reduction, indicating that the supercapacitor possesses good flexibility and low temperature resistance. These findings are desirable for applications in supercapacitor devices of flexibility or low working temperature. Graphical abstract Image 1 Highlights • KOH playing two roles of ionic donator and cross-linking agent in the AGPE. • Outstanding tensile property and ionic conductivity of PVA/carrageenan AGPE. • Superior properties of supercapacitor under deformation and low temperature. [ABSTRACT FROM AUTHOR]