The invention discloses a change-over control mechanism of a change-over switching device. The change-over control mechanism comprises a supporting unit (1), a control execution unit (2), a positioning unit (3) and a stroke indicating unit (4), wherein the control execution unit (2) is arranged in the supporting unit (1); the positioning unit (3) is arranged in the supporting unit (1) and is assembled together with the control execution unit (2); and the stroke indicating unit (4) is arranged on the supporting unit (1). The change-over control mechanism has the advantages that gear transmission and a sliding block are combined, so that the change-over control mechanism of the small-size change-over switch can be directly assembled with the existing finished isolating switch product; the change-over control mechanism is applicable to the change-over switch assembled by a front swinging type handle isolating switch and a rear swinging type handle isolating switch, and directly realize change over of a common power system and a spare power system on a control switch; the whole structure is simple, the interchangeability and the versatility are strong, and the installation, use and maintenance are convenient.