The utility model discloses a modularized permanent magnetic operating mechanism and a circuit breaker applying the same. The permanent magnetic operating mechanism comprises a shell and a mechanism output shaft which is rotatably assembled in the shell with the axis extending along the front-rear direction. The permanent magnetic operating mechanism further comprises a permanent magnetic mechanism and a manual control mechanism which drive the mechanism output shaft to rotate through driving mechanisms thereof, wherein the manual control mechanism comprises a handle operating shaft rotatably assembled in the shell, and the handle operating shaft and the mechanism output shaft are parallelly arranged. A front supporting plate and a rear supporting plate, which are arranged at intervals back and forth, are fixed in the shell, the mechanism output shaft and the handle operating shaft are rotatably assembled on the front and rear supporting plates respectively, and the permanent magnetic mechanism is fixedly assembled on one of the supporting plates. The permanent magnetic mechanism, the manual control mechanism, the mechanism output shaft, the driving mechanism of the permanent magnetic mechanism, and the driving mechanism of the manual control mechanism are integrated to form modularization, thereby effectively solving the problem that the structural configuration is not compact, and improving the reliability of the circuit breaker.