The invention relates to an all-state monitoring apparatus for opening and closing of a circuit breaker. Potential changing at two ends of a circuit breaker auxiliary contact point of the opening-closing loop is monitored by using an optoelectronic signal acquisition module MC and then whether the operation state of the opening-closing loop is correct is determined. The output of the optoelectronic signal acquisition module MC controls the on/off of a relay KA; and the auxiliary contact point of the relay KA is led out, thereby realizing opening-closing loop state indication and state alarming. The provided apparatus has the following advantages: the total operation state of the opening-closing loop of the circuit breaker is monitored accurately, thereby avoiding the monitoring dead zone; with the photoelectric acquisition technology, the optoelectronic isolation function is realized, thereby preventing the loop interference; on the basis of the photoelectric acquisition technology, the signal can be collected correctly and reliably and the response speed is fast; and the sampling loop current that is less than 2mA is low, so that normal working of the original opening-closing loop relay is not influenced and thus the accident occurrence probability is reduced.