Outdoor column upper high-voltage alternating-current vacuum circuit breaker

The invention relates to an outdoor column upper high-voltage alternating-current vacuum circuit breaker which comprises an insulating cylinder and a box body. A vacuum arc extinguish chamber is arranged in the insulating cylinder. An upper wire outlet base is arranged at the fixed end of the vacuum arc extinguish chamber. The fixed end of the vacuum arc extinguish chamber and the upper wire outlet base are detachably connected together. The movable end of the vacuum arc extinguish chamber is provided with conductive clamps and a copper bar. A flexible connection part of a U-shaped structure is reversely buckled on and wraps the conductive clamps. The copper bar is fixedly connected with the bottom of the U-shaped flexible connection part. The conductive clamps are fixedly connected with the two lateral sides of the flexible connection part respectively. Bent arc-shaped structures are arranged on the two lateral sides of the flexible connection part. The integrated long-creep-distance insulating cylinder is adopted, and therefore the circuit breaker can be suitable for high-altitude places; a main circuit is of a single-electrode independent type structure, and therefore the circuit breaker has high dirt resistance and high environment protection capacity; due to the connecting mode of the copper bar and the flexible connection part, the requirement for large loads can be met; the upper wire outlet base is fixed to the vacuum arc extinguish chamber through bolts, and due to the structure, the upper wire outlet base can be conveniently detached and replaced with upper wire outlet bases of different specifications.