The invention relates to the field of a high-voltage electrical apparatus, and especially relates to a circuit breaker and three-position switch interlocking device and a circuit breaker-three-position switch device. The circuit breaker and three-position switch interlocking device comprises a side plate, a tripping assembly, a circuit breaker reclosing self-locking assembly and a three-position switch interlocking assembly, wherein the tripping assembly, the circuit breaker reclosing self-locking assembly and the three-position switch interlocking assembly are arranged on the side plate. The tripping assembly comprises a closing trigger crank arm; the circuit breaker reclosing self-locking assembly comprises a reclosing locking trigger crank arm; the three-position switch interlocking assembly comprises a locking three-position trigger crank arm; the closing trigger crank arm, the reclosing locking trigger crank arm and the locking three-position trigger crank arm are coaxial, synchronous and rotary crank arms; the closing trigger crank arm is provided with a just closing position and a closing position in sequence along the closing operation action direction; and triggering time of the reclosing locking trigger crank arm and triggering time of the locking three-position trigger crank arm are before the closing trigger crank arm arrives at the just closing position. The problem that a circuit breaker and a three-position switch cannot be interlocked midway in the operation process is solved.