An interlocking device for a circuit breaker, comprising a control assembly and an interlocking assembly which are connected with each other in a driving manner; the control assembly can be connected with a connecting rod assembly and a cam assembly of an energy storage operation mechanism of the circuit breaker in a latching manner, thereby controlling the energy storage operation mechanism to finish a switching-on/switching-off operation; the control assembly comprises a switching-off semi-half, a switching-off latch, a switching-on half-shaft and a switching-on latch; the interlocking assembly comprises a switching-on guide rod, a switching-off guide rod and a driving guide rod; the switching-off latch is connected with the connecting rod assembly and the cam assembly; the switching-on guide rod is connected with the control assembly in a driving manner, such that the switching-on latch actuates; the switching-off guide rod is connected with the control assembly in a driving manner, such that the switching-off latch actuates; one end of the switching-on half-shaft is connected with the switching-on latch in a driving manner, and the other end of the switching-on half-shaft and the driving guide rod face each other; one end of the switching-off latch is connected with the switching-off half-shaft in a latching manner, and the other end of the switching-off latch is connected with the connecting rod assembly in a latching manner; the interlocking assembly further comprises an interlocking guide rod and an energy storage indicator; the energy storage operation mechanism of the circuit breaker comprises a rotating shaft assembly for driving the switching-on/switching-off operation; the middle part of the interlocking guide rod is rotatably mounted on the energy storage operation mechanism; one end of the interlocking guide rod is a limiting portion which corresponds to the rotating shaft assembly and the energy storage indicator, and the other end of the interlocking guide rod is a driving portion which is in contact and connection with the switching-on guide rod; the rotating shaft assembly and the energy storage indicator can be in contact and matched with the limiting portion of the interlocking guide rod, such that the interlocking guide rod acts on the switching-on guide rod; when the energy storage operation mechanism is in a switching-off energy storage state, the driving portion of the interlocking guide rod does not limit a switching-on interlocking portion of the switching-on guide rod. the switching-off latch is connected with the connecting rod assembly and the cam assembly; the switching-on guide rod is connected with the control assembly in a driving manner, such that the switching-on latch actuates; the switching-off guide rod is connected with the control assembly in a driving manner, such that the switching-off latch actuates; one end of the switching-on half-shaft is connected with the switching-on latch in a driving manner, and the other end of the switching-on half-shaft and the driving guide rod face each other; one end of the switching-off latch is connected with the switching-off half-shaft in a latching manner, and the other end of the switching-off latch is connected with the connecting rod assembly in a latching manner; the interlocking assembly further comprises an interlocking guide rod and an energy storage indicator; the energy storage operation mechanism of the circuit breaker comprises a rotating shaft assembly for driving the switching-on/switching-off operation; the middle part of the interlocking guide rod is rotatably mounted on the energy storage operation mechanism; one end of the interlocking guide rod is a limiting portion which corresponds to the rotating shaft assembly and the energy storage indicator, and the other end of the interlocking guide rod is a driving portion which is in contact and connection with the switching-on guide rod; the rotating shaft assembly and the energy storage indicator can be in contact and matched with the limiting portion of the interlocking guide rod, such that the interlocking guide rod acts on the switching-on guide rod; when the energy storage operation mechanism is in a switching-off energy storage state, the driving portion of the interlocking guide rod does not limit a switching-on interlocking portion of the switching-on guide rod.