Contact service life detection device and circuit breaker with same

The invention provides a contact service life detection device and a circuit breaker with the same, and belongs to the technical field of circuit breakers, and the contact service life detection device comprises a substrate which is provided with a receding hole used for receding a rotating shaft of a movable contact frame, and a variable resistance assembly is arranged around the receding hole; the sliding sheet is provided with a feeler used for being in sliding electric contact with the variable resistance assembly, and the sliding sheet is used for being in linkage connection with a movable contact frame; the circuit board is electrically connected with the variable resistance assembly on the substrate, and the resistance value of the variable resistance assembly is detected through the circuit board; the sliding piece on the variable resistance assembly is in linkage connection with the moving contact frame, the variable resistance assembly causes resistance change according to the position change of the