The invention relates to a process for preparing high-performance conducting fiber, which comprises first, preprocessing, washing out foreign matters on the surface of fiber, second, coursing, adopting coursing agent to immerse fiber, and to improve the surface structure of the fiber, leading the surface to be roughness which is beneficial for absorbing metallic ion, third, sensitizing, utilizing stannous chloride or cadmium chloride solution to immerse fiber, leading the surface of fiber to absorb a layer of tin ions and cadmium ions, thereby forming a layer of metal catalytic layer, fourth, chemically coating silver, fifth, solidifying, utilizing oxalic acid solution to immerse, and getting end products after drying. The invention is simple and is easy to be operated, compared with the traditional electric plating, conducting fiber which is prepared by the invention has excellent electrical conductivity property, specific surface area specific resistance reaches 2-10 Ohm, and the characters of the original fibers are kept, the hand feeling is soft, and the invention can be applied in various commingled yarn fabrics.