Abstract: To solve the problems of preparation process, flexibility, and flexibility of friction electric fibers, super-elastic triboelectric fibers were prepared by using an extrusion-filling method.The liquid metal EGaIn and thermoplastic elastomer material were used as the conductive electrode and the fiber sleeve, respectively.The fiber could sustain strains up to 2 200% and exhibited high electrical outputs.By using a 5 cm long fiber as the medium, the fiber can provide an unsaturated average open circuit voltage of 7 V when in contact with paper; and the instantaneous power density of 1.6 μW/ m was obtained with an external load resistance of 200 MΩ.Weaning the fiber into an 8 cm×8 cm textile, the max electrical outputs were 120 V, 280 nA, 28 nC.Results show that the extrusion-filling technology is an effective way to develop stretchable triboelectric fibers.The super-elastic fibers in this work have the potential for multi-functional wearable smart textiles applications.