The utility model discloses an improved oxygen supply pipe joint for a converter. The oxygen supply device comprises an oxygen supply pipe for supplying oxygen to the steelmaking converter, an oxygensupply pipe connector installed on the oxygen supply pipe in a matched mode is structurally composed of an inserting pipe and a connector pipe base. wherein the inner diameter of the connector pipe seat is in movable fit with the outer diameter of the quartered steel pipe, three screw holes are evenly distributed in the outer wall of the connector pipe seat in the radial direction, puller bolts are installed in the screw holes respectively in a matched mode, the ends of the puller bolts are matched with the outer wall of the quartered steel pipe, and the outer diameter of the inserting pipe ismatched with the inner diameter of the oxygen supply pipe. The oxygen supply pipe joint locking device is reasonable in structure, good in locking function and capable of achieving safe locking of the oxygen supply pipe joint and prolonging the service life of the oxygen supply pipe joint.