The invention relates to a circuit breaker-three-station switch device and a circuit breaker and three-station switch interlocking device. The interlocking device includes a mechanism shell and a mechanism side plate fixedly assembled together. The mechanism side plate is equipped with a three-station interlocking plate capable of moving in a reciprocating manner in the up-down direction. The three-station interlocking plate is equipped with an interlocking component used together with a corresponding latching three-station trigger crank arm in a matching manner. The interlocking device further includes a stroke conversion part hinged to the mechanism shell. The stroke conversion part is connected with a traction rope used for being in transmission connection with the valve of a three-station switch to pull the stroke conversion part to rotate in the horizontal direction. An adapter piece is hinged between the stroke conversion part and the three-station interlocking plate so that thestroke conversion part, the adapter piece and the three-station interlocking plate form a crank-slider structure. Through the cooperation of the crank-slider structure and the traction rope, the design accuracy requirement of the whole transmission mechanism is met, and excessive offset or jamming is avoided.