The invention relates to an automatic detection system of a moulded case circuit breaker. The automatic detection system comprises a circulation material transmission component, and a running-in synchronism detection component, an overrun opening range detection component, a final pressure resistance detection component, an instantaneous test component, a time delay test component, a reliability detection component and a plurality of waste collection components, which are straddled on the circulation material transmission component and are arranged in sequence; the waste collection components are independently cooperated with the running-in synchronism detection component, the overrun opening range detection component, the final pressure resistance detection component, the instantaneous test component, the time delay test component and the reliability detection component. Through the running-in synchronism detection component, the overrun opening range detection component, the final pressure resistance detection component, the instantaneous test component, the time delay test component and the reliability detection component which are arranged in sequence, the automatic detection of the moulded case circuit breaker can be realized, and working efficiency is improved.