An automatic change-over switching device comprises a base plate, a combined support, a motor, two circuit breakers, a mandrel, two release catches, two sliders, two plate springs, two indicator lamp microswitches, two motor stopping microswitches, a double-pole microswitch, a controller and a casing. The motor and the circuit breakers are all fixed on the combined support, so that transmission level of a transmission part can be effectively reduced, accumulated errors of the position of the transmission part caused by multi-level transmission during working can be reduced, the problem of misoperation caused accordingly can be solved, and normal production can be ensured. Further, a transmission operation mechanism on the automatic change-over switching device is reasonable in structure, and an operating member has good accuracy in operating switch handles on the circuit breakers and is high in safety performance.