The utility model discloses an exhaust structure of circuit breaker, including a gas vent, the afterbody of explosion chamber is aimed at to this gas vent, and overlap with the termination of circuit breaker in the exhaust space of this gas vent, occupies the exhaust space when termination does not work a telephone switchboard, vacates the exhaust space during termination wiring. The utility model discloses a circuit breaker that has above -mentioned exhaust structure has still been revead. The utility model discloses an exhaust structure of circuit breaker has utilized termination's vacant space, has increased the quantity of gas vent, has increased the exhaust space for the exhaust capacity is being shown to be promoted, and the protruding effect of supporting the explosion chamber of playing simultaneously still and set up and cut apart the arch and come the subdividing the arc, should be cut apart to this exhaust structure, avoided the explosion chamber to receive that the arc extinguishing ability that shifts and lead to that produces of strikeing reduces.