The invention discloses an intelligent circuit breaker driven by an ultrasonic motor. The intelligent circuit breaker comprises a base, an end cap, a stator and a rotor, wherein the stator and the rotor are vertically superposed between the base and the end cap. The stator is coaxial with the rotor. A pinion is arranged on a shaft, and a large gear and the pinion are arranged side by side. The large gear is arranged on the base through a circular shaft. The end cap is provided with a first light hole in which the shaft is arranged. The base is provided with a second light hole in which the circular shaft is arranged. The circuit breaker further comprises a motion conversion module, a drive control module and a sensor device. A part of the large gear is connected with the motion conversion module and drives the motion conversion module in different cases, so as to realize automatic opening and closing of a knife switch. The drive control module is arranged on the base, and an electronic component is arranged on the drive control module. The sensor is used to feed back a circuit signal, and the work of a system is in closed-loop control.