The invention provides a double-break vacuum circuit breaker used for 66 KV. The vacuum circuit breaker comprises two break devices with the same structure, each break device is arranged in a vacuum arc-extinguishing chamber, the break device comprises a static contact and a moving contact, a vacuum gap is reserved between the static contact and the moving contact, tail portions of the moving contacts at two sides are connected in series through a connecting rod, the connecting rod is provided with a bidirectional repulsive force mechanism and a permanent magnet maintenance mechanism in sequence, the bidirectional repulsive force mechanism comprises a metal repulsive force disc, the connecting rod is also provided with an upper fixing plate and a lower fixing plate parallel to the metal repulsive force disc, the metal repulsive force disc is located between the upper fixing plate and the lower fixing plate, the lower end surface of the upper fixing plate is fixedly connected with a switch-off coil, and the upper end surface of the lower fixing plate is provided with a switch-on coil. The beneficial effects of the vacuum circuit breaker are that the on-off 66 KV voltage level is realized through double breaks, the double breaks are linked by employing an electromagnetic repulsive force, a mechanical locking structure is avoided, fault sources are less, the usage reliability is high, the operation precision and the synchronism of the break devices are high, and the reaction can reach a microsecond level.