Vacuum circuit breaker

The invention relates to a vacuum circuit breaker. The vacuum circuit breaker comprises a pole insulating sleeve, an operating mechanism, a supporting piece, an insulating pull rod, a connecting rod,a sealing flange, a corrugated pipe and a cover plate; a sealing chamber for filling high-voltage insulating gas is arranged between the pole insulating sleeve and the insulating pull rod, the corrugated pipe sleeves the connecting rod, one end of the corrugated pipe is fixedly connected to the sealing flange, the other end of the corrugated pipe is sealed by the cover plate to divide the interiorof the corrugated pipe and the exterior of the corrugated pipe into two independent chambers, and the corrugated pipe is fixed and sealed with the connecting rod through the cover plate; the corrugated pipe is arranged in the pole insulation sleeve, and an internal cavity of the corrugated pipe is communicated with the outside atmosphere; or the corrugated pipe is arranged outside the pole insulation sleeve, and the inter