According to an aspect of the present invention, a conductive fiber comprising a stretchable fiber and a conductive nanostructure, wherein at least a portion of a stretchable fiber surface is coated with the conductive nanostructure, the conductive fiber has a supercoil shape Disclosed is a conductive fiber. The fiber of the present invention corresponds to a new structure made of high structural compression by excessive twisting insertion and by storing a large linear deformation in the longitudinal direction of the fiber, and the supercoil-type fiber has high elasticity without great electrical damage ( ~1500%). This high level of structural construction allows storage of ultra-linear strains, allowing the use of extendable, conductive transmission lines, pseudocapacitive supercapacitors and supercoil fibers for artificial muscles.
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