The invention relates to a circuit breaker and an insulation pull rod guide device of the circuit breaker. The circuit breaker comprises a transmission shaft, a moving contact and an insulation pull rod connecting the transmission shaft with the moving contact, and further comprises the insulation pull rod guide device. The insulation pull rod guide device comprises guide discs allowing the insulation pull rod to penetrate through and guiding assembly; the at least two guide discs are arranged at intervals in an axial direction of the insulation pull rod; the insulation pull rod guide device further comprises fixing seats arranged at the two axial ends of the insulation pull rod guide device; and the fixing seats and the adjacent guide discs, as well as the two adjacent guide discs are connected through support rods arranged at intervals around the center lines of the guide discs. The guide discs support the insulation pull rod in a radial direction; the flexibility of the insulation pull rod is reduced; phenomena of destabilization and vibration of the insulation pull rod when the insulation pull rod is under stress are avoided; and the insulation pull rod guide device is simple in structure and convenient to manufacture.