A nozzle for a high-pressure SF6 circuit breaker and with a cylindrical bulge relates to the field of power transmission and transformation equipment. The nozzle comprises a large nozzle, a small nozzle and a movable arc contact, wherein a plurality of cylindrical bulges are arranged on surfaces of the large nozzle and the small nozzle, the plurality of cylindrical bulges of the large nozzle are arranged on a surface of a port of a passage formed by the large nozzle and the small nozzle, the plurality of cylindrical bulges of the small nozzle are arranged on a surface of a port of a passage formed by the small nozzle and the large nozzle, and the surface, close to an end part of the movable arc contact, of the small nozzle. The invention designs and provides the nozzle for the high-pressure SF6 circuit and with the cylindrical bulge, the shape of the nozzle is changed, arc extinguishing gas flow can generate regularly-changing vortex at a rear part of a cylinder on a surface of the nozzle, a large amount of energy can be rapidly taken away during the arc blowing process, and the arc quenching capability of the circuit breaker is improved.