A drive mechanism for transposition and stirring by single disc single motor includes a rotating transposition disc, wherein the transposition disc is a single-layer transposition disc, at least one gear set in which a gear ring is engaged with a planetary gear is arranged successively from inside to outside with the rotating shaft of the single-layer transposition disc as the center, the gear ring of each gear set is fixed on a rack, and the planetary gear engaged with the gear ring is rotationally installed on the transposition disc to serve as a driving gear of a stirring shaft of a color matching paint bucket. By adoption of the above technical solution, the present invention has the following beneficial effects: the structure is reasonable, the parts and components of the color mixing machine are reduced without reducing and decreasing the functions of the color mixing machine.