The utility model discloses a circuit breaker operating mechanism status monitoring device, including power supply plug, monitor main plug -in components, first collection plug -in components, second collection plug -in components, open plug -in components and leave plug -in components, pass through between each plug -in components the inside CAN of monitoring devices net, high -speed serial interface and to the time bus connection. The utility model discloses a circuit breaker operating mechanism status monitoring device adopts and to insert the boxed structure design, and each plug -in components are pegged graft on the subrack, the easy upgrading, the expansibility is strong, each plug -in components need not any regulation in the scene after through the automatic monitoring before dispatching from the factory, avoided the human factor to produce property can the influence, the reliability is high.