The invention relates to a snap-through rotary switch. A locking device is arranged on a moving contact frame, a locking structure is arranged on a middle seat; an unlocking device and an elastic assembly are arranged between a movable frame and the moving contact frame; when a rotary assembly rotates within a threshold value range, the moving contact frame is locked on the middle seat under cooperation of the locking device and the locking structure, and the movable frame moves relative to the moving contact frame to compress the elastic assembly so that the elastic assembly can store energy; when the rotary assembly rotates to a threshold value point, the unlocking device drives the locking device to break away from the locking structure, and the moving contact frame moves under the energy storage action of the elastic assembly to drive a moving contact to make contact with or break away from a static contact. The elastic assembly serving as an energy storage device is matched with the locking device and the unlocking device, the moving contact can rapidly break away from or make contact with the static contact, and therefore the contacting force of the moving contact and the static contact of the snap-through rotary switch is stable.