The utility model discloses a countercurrent chromatograph with a small rotating radius unknotting shaft structure, which comprises a box body, a rotating shaft, an outer disc, separation columns, a connecting pipeline and an unknotting shaft, wherein the rotating shaft is a rotating shaft which rotates around the outer disc; a fixed central gear is arranged in the center of the rotating shaft; the separation columns are loaded on the outer disc; the multiple separation columns are arranged; a gear connected with each separation column into a whole is arranged in the center of the separation column; the gears in the centers of the separation columns are meshed with the central gear; an unknotting gear is meshed with the separation column gears; the center of the unknotting gear is provided with the unknotting shaft; and the countercurrent chromatograph with the small rotating radius unknotting shaft structure is characterized in that a coaxial small gear is arranged above the central gear of the separation columns, is concentric with the separation columns and is meshed with the unknotting gear through the small gear; the rotating radius of the unknotting shaft which is equipped with the unknotting gear and runs around the center of the rotating shaft is smaller than the rotating radius of a planetary gear which runs around the center of the rotating shaft; the unknotting shaft is called as a small rotating radius unknotting shaft; one or multiple small rotating radius unknotting shafts are arranged.
