The invention discloses a bistable state ultra-high-speed operating mechanism, a DC circuit breaker and a control method. The bistable state ultra-high-speed operating mechanism comprises contacts, anelectromagnetic repulsive force mechanism, an opening and closing maintaining device and a buffer device, a fixed contact is in threaded connection with an incoming line copper bar, a moving contactis in threaded connection with an insulation pull rod, and the moving contact is connected with an outgoing line copper bar through a watch strap contact finger; the electromagnetic repulsive force mechanism comprises a repulsive force disk, the insulation pull rod, a charge and discharge circuit and a controller, wherein the repulsive force disk drives the moving contact through the insulation pull rod, the charge and discharge circuit comprises a driving capacitor with a pre-charge function, a control thyristor and a coil, which are connected in series, a freewheel diode is connected in parallel to both ends of the coil reversely, the controller is connected with and controls the control thyristor to trigger to achieve opening and opening operations of the mechanism; and the opening andclosing maintaining device comprises an opening and closing maintaining spring, an opening and closing maintaining slide block, a spring bracket, a transmission link and a transmission flange, and thebuffer device comprises a buffer, a stop sleeve for stopping the transmission flange, a closing reset spring and a reset slide block for reset.