The invention discloses a vacuum circuit breaker. The vacuum circuit breaker comprises a vacuum arc extinguishing chamber, wherein a static contact and a movable contact are arranged in the vacuum arcextinguishing chamber, an automatic static contact and an automatic movable contact are arranged outside the arc extinguishing chamber, a current passes through a first passage where the static contact and the movable contact in the vacuum arc extinguishing chamber are located and a second passage where the automatic static contact and the automatic movable contact are located when the vacuum circuit breaker is closed and is transmitted to a lower conductive seat of the vacuum circuit breaker. By the vacuum circuit breaker, the technical problem that a current of the vacuum circuit breaker inthe prior art is easy to occur to cause temperature rising exceeding a preset standard is solved.