This article presents a sustainable dual cross-linked cellulose hydrogel electrolyte (DCZ-gel) designed to address the challenges of dendrite formation, parasitic side reactions, and sluggish Zn²⁺ ion transfer in aqueous rechargeable zinc-metal batteries (ARZBs). The DCZ-gel is fabricated using a sequential chemical and physical cross-linking method, resulting in high mechanical strength, abundant porous structure, and excellent Zn²⁺ ion binding capacity. This electrolyte significantly enhances the stability and performance of ARZBs, enabling stable cycling for over 400 hours at a high current density of 10 mA cm⁻² and achieving high-rate and long-term cycling performance (>2000 cycles at 2000 mA g⁻¹) in Zn|polyaniline cells. The DCZ-gel is also biodegradable and easy to access, making it a promising candidate for scalable and sustainable ARZBs. The study demonstrates the effectiveness of the DCZ-gel in suppressing dendrites, reducing side reactions, and improving ionic transport, leading to superior electrochemical performance compared to liquid electrolytes and other polysaccharide-based hydrogel electrolytes.This article presents a sustainable dual cross-linked cellulose hydrogel electrolyte (DCZ-gel) designed to address the challenges of dendrite formation, parasitic side reactions, and sluggish Zn²⁺ ion transfer in aqueous rechargeable zinc-metal batteries (ARZBs). The DCZ-gel is fabricated using a sequential chemical and physical cross-linking method, resulting in high mechanical strength, abundant porous structure, and excellent Zn²⁺ ion binding capacity. This electrolyte significantly enhances the stability and performance of ARZBs, enabling stable cycling for over 400 hours at a high current density of 10 mA cm⁻² and achieving high-rate and long-term cycling performance (>2000 cycles at 2000 mA g⁻¹) in Zn|polyaniline cells. The DCZ-gel is also biodegradable and easy to access, making it a promising candidate for scalable and sustainable ARZBs. The study demonstrates the effectiveness of the DCZ-gel in suppressing dendrites, reducing side reactions, and improving ionic transport, leading to superior electrochemical performance compared to liquid electrolytes and other polysaccharide-based hydrogel electrolytes.