The invention discloses a novel high-voltage circuit breaker and a control method thereof. The novel high-voltage circuit breaker mainly comprises a measuring unit, a DSP control unit, a driving unit,an inversion unit, a brushless DC motor and a high-voltage circuit breaker operating mechanism unit. The control method comprises the following step: improving an observer to enable the observer to have disturbance estimation capability so as to realize disturbance rejection tracking control. The embodiment of the invention provides a novel high-voltage circuit breaker and a control method thereof, so as to realize motion characteristic control of the high-voltage circuit breaker. The mathematical description of the operating mechanism has a certain inexact part, the complex system of the operating mechanism has a non-linear part, and the opening and closing of the operating mechanism are subjected to different electric forces when different line currents exist, which all affect the control of the operating mechanism. The above parts are defined as disturbance, and the disturbance is observed and estimated through an improved control strategy; disturbance elimination is achieved through feedback, and finally the control target of the performance requirement of the high-voltage circuit breaker in the moving process is achieved.