A drive mechanism for transposition and stirring by single disc single motor includes a rotating transposition disc (1), wherein the transposition disc is a single-layer transposition disc (1), at least one gear set (4,5) in which a gear ring (4,5) is engaged with a planetary gear (6) 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 (6) engaged with the gear ring (4,5) is rotationally installed on the transposition disc (1) to serve as a driving gear of a stirring shaft of a color matching paint bucket. Due to this, 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, so that the failure rate and the production cost of the color mixing machine are greatly reduced.