▎ 摘　　要

NOVELTY - A composite fiber comprises conductive fiber and nanofiber sheath covering surface of the conductive fiber. The nanofiber sheath comprises three-dimensional porous structure formed by interweaving polymer nanofibers and filling ionic liquid. USE - Composite fiber used in artificial muscle for intelligent drive mechanism (all claimed). ADVANTAGE - The composite fiber has prolonged service life, excellent stability in air, low influence on solvent evaporation and wide electrochemical window compared with organic or inorganic electrolytes used as ionic liquid, and improves the stability of the electrochemical artificial muscle fiber used in the air. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the composite fiber, which involves twisting several conductive fibers until uniform spiral structure is formed, or twisting single conductive fiber to form uniform spiral structure, then re-twisting single conductive fiber to form uniform spiral structure, fabricating the surface of the conductive fiber to form the nanofiber sheath, forming three-dimensional porous structure by interweaving polymer nanofibers, and immersing the nanofiber sheath in ionic liquid, so that the ionic liquid is filled in the three-dimensional porous structure of the nanofiber sheath; (2) artificial muscle fiber, which comprises spiral fibers comprising helical structure formed by twisting the composite fiber; (3) artificial muscle, which is prepared by connecting at least one spiral fiber in artificial muscle fiber to positive electrode of power source, and connecting at least another spiral fiber to negative electrode of the power source; and (4) intelligent driving mechanism, which comprises the artificial muscle and power assembly of intelligent robot.