The invention belongs to the technical field of new energy and specifically relates to a super-flexibility silicon-oxygen cell fiber and a preparation method thereof. The super-flexibility silicon-oxygen cell fiber is formed by a SiLi/carbon nano tube composite fiber, polymer gel electrolyte, carbon nano tube air electrode and a perforated heat-shrink tube in a form of a coaxial structure. According to the super-flexibility silicon-oxygen cell fiber, the discharge energy density in air can reach 512 Wh/kg, and the super-flexibility silicon-oxygen cell fiber can work stably after 20,000 times of cyclic bending; owing to the super-flexibility, the super-flexibility silicon-oxygen cell fiber can maintain stable electrochemical performance under different degrees of deformation; meanwhile, dueto the fibrous shape, the super-flexibility silicon-oxygen cell fiber can be separately weaved into fabric, can be co-weaved with a textile into fabric and has wide application prospect in the wearable electronic field.