Refining oxygen lance involves steel smelting equipment parts, including the nozzle end face, outer pipe, middle pipe, inner pipe, outer pipe as the outlet pipe, middle pipe for pressure pipe, inner pipe for the oxygen tube. The characteristic is: the hole of blowing oxygen is Laval hole, the ratio of exit and throat area is between 1.148～1.919, dip angle α of blowing oxygen hole can be designed between 80～270 according to the different shape of ladle or furnace model, and the amount of the hole is between 2～20 which are arranged adopting symmetric or not into two forms, size and quantity decided according to the smelting condition to strive to reach the goal of oxygen blowing area wide and stir well.