The invention relates to a circuit breaker capable of breaking and closing simultaneously and an elastic adjustment device thereof. The elastic adjustment device is simple in structure and reasonable in design, is convenient to use and can be used for simultaneously adjusting breaking and closing of the circuit breaker. The elastic adjustment device comprises an adjustment sleeve, a sliding pull rod, a base and an elastic component, wherein the elastic component is used for simultaneously adjusting breaking and closing, one end of the base is opened, the base and the adjustment sleeve in threaded connection with an opening end of the base form an elastic adjustment compartment, one end of the sliding pull rod is arranged in the elastic adjustment compartment, the elastic component is arranged between the sliding pull rod and the adjustment sleeve, the other end of the sliding pull rod extends out of the elastic adjustment bin, and an extending end of the sliding pull rod and a pull rod connected with the adjustment sleeve or the base are respectively used as two connection ends of the elastic adjustment device. The circuit breaker capable of breaking and closing simultaneously comprises an operating mechanism, a plurality of circuit breakers, connection pull rods and the elastic adjustment device mentioned by the invention, wherein the connection pull rods are connected between the operating mechanism and the plurality of circuit breakers.