A three-station disconnecting switch operating mechanism is disclosed. A fixing frame used for mounting the operation mechanism is arranged. The operating mechanism comprises a main shaft, a locating and self-locking mechanism, and an electrical linkage mechanism. The main shaft is equipped with a fusiform state indicating cam. One end of the state indicating cam is provided with a state indicating board through a bearer, while the other end of the state indicating cam is provided with a pull pin. A linkage mechanism A is mounted between the main shaft and a closing linkage shaft of an external circuit breaker. A linkage mechanism B is mounted between a main shaft of the external circuit breaker and the operating mechanism. The operating mechanism is advantaged by simple structure, ingenious design, reduced cost, and decreased size. The operating mechanism can be mounted and used in a ring network cabinet conveniently. The door machine linkage operation and the linkage operation of the operating mechanism and the external circuit breaker are realized, and the stability and the safety of operation of a high voltage power distribution system are improved.