The invention discloses a vacuum switch, a related mechanism, a system and an application. A holding mechanism of the vacuum switch comprises a closing magnet, an opening magnet and a magnetic conductive attraction plate; and the magnetic conductive attraction plate is fixedly connected with a middle shaft rod of the vacuum switch, and is driven by the middle shaft rod to attract the closing magnet or the opening magnet. The problems of long time and low speed of opening and closing of the vacuum switch in the prior art are solved.