The invention provides a novel self-locking driving structure of a single rotating shaft of a double-fragment automatic change-over switching device. The structure is characterized in that electromagnet assemblies which are symmetrically arranged on a bracket assembly are used as a power source to drive a single rotating shaft assembly to rotate so as to realize the on and off of the double-fragment automatic change-over switching device; the position of the electromagnet in place is mechanically locked by the angle deflection of a swinging arm mounted on the single rotating shaft assembly when a link structure moves to reach a stopping position and under the effect of a force applied by a pressing spring to the link structure; meanwhile, an assistant switch is added at the arriving position of the moving single rotating shaft in order to cut off the power supply of the electromagnet assembly in place and then moves in match with other structures to as to realize electrical interlocking. According to the novel self-locking driving structure of the single rotating shaft of the double-fragment automatic change-over switching device, the structure is simple, the reliability is high, the output force is large, the speed is fast, the assembling process is simple, and a large rated-current automatic change-over switching device product applies.