Tank-type vacuum circuit breaker

The invention discloses a tank type vacuum circuit breaker which comprises a metal shell and an internal vacuum arc-extinguishing chamber, and further comprises a static end connecting conductor and a moving end connecting conductor which are located at the two ends of the vacuum arc-extinguishing chamber. A moving and static contact system in the vacuum arc-extinguishing chamber forms a vacuum fracture; a sealed compartment is formed between the inner wall of the metal shell and the outer wall of the vacuum arc-extinguishing chamber; a static-end conductive piece and a moving-end conductive piece are arranged in the sealed compartment, the static-end conductive piece is electrically connected with the static-end connecting conductor and faces the moving-end conductive piece, the moving-end conductive piece is connected with the moving-end connecting conductor and faces the static-end conductive piece, and the free ends of the two conductive pieces face each other to form a gas fracture. By arranging the stat