The utility model belongs to the technical field of electric devices and especially relates to a guide device preventing an insulation pull rod of circuit breaker from being pulled off. The guide device includes a hydraulic mechanism, a circuit breaker pedestal and an insulation pull rod. A working cylinder is connected with the circuit breaker pedestal through a connection barrel. One end of a piston rod in the working cylinder is connected with one end of a transmission connection rod a in the connection barrel. The other end of the transmission connection rod a is connected with a transmission connection rod b through a disintegration joint. The transmission connection rod b is inserted into the circuit breaker pedestal through a slide sealing piece to connect with the insulation pull rod. The guide device is arranged on the transmission connection rod a. According to the utility model, peripheral positioning of the guide rod, a guide body and a guide rail can be realized, so that mechanical characteristics of the insulation pull rod is prevented from being changed due to rotation forces and the safety performance of a circuit breaker is thereby guaranteed. At the same time, by employing a mechanical transmission auxiliary switch, the problem that maintenance difficulty due to oil leak of a signal cylinder is solved. The guide device is simple in structure and safe and reliable in use. By using the guide device, the cost can be reduced substantially and safety and practicability are achieved.