Outdoor self-energy high voltage SF6 circuit breaker is applied for power systems with AC 50Hz and 110kV, and adopts outdoor design with three-phase porcelain pillar structure. Equipped with a spring operating mechanism, the three-phase pillar has a center layout, a three-phase sequence and an elaborate appearance. This kind of circuit breaker takes SF6 gas as insulated and arc extinguishing medium, and also adopts the self-extinguishing arc principle and optimizes the design in the circuit breaker motion system, which effectively improves the mechanical efficiency and reduces the operation power. It can also be used as control and protection equipment of power system or a contact circuit breaker with strong breaking capacity, small operation power and high reliability.