In recent years, conductive gel materials have attracted extensive attention in the field of flexible electronics because of their excellent elasticity. When constructed as gel fibers, they can adapt to greater deformation, be woven, and be assembled with fabrics to make wearable smart devices without compromising comfort. However, gel fibers reported often exhibit insufficient mechanical properties and poor adaptability to different environment. Herein, a super-stretchable ionic conductive gel fiber is reported. It is formed via a solvent-free template-assisted strategy, with a polyacrylamide (PAM) - TEMPO-mediated oxidized cellulose nanofibrils (TOCNF) double-network as main structure. The influence of each component content was analyzed. The addition of TOCNF significantly toughens the fiber (breaking strength, strain and toughness of 3.55 MPa, 1715.66 % and 4.75 MJ/m