Analysis of the energy balance of various parts during the basic oxygen furnace (BOF) steelmaking is of vital importance for revealing the blowing characteristics of the swirl-type oxygen lance. The energy transfer behavior between the oxygen jet and the molten bath in the top-blowing steelmaking process was investigated using the volume of fluid method. The energy of the reflected jet and the slag was introduced, and the energy balance model of the BOF converter was modified. The influences of lance height and operation pressure on energy transfer were analyzed. Compared with the traditional oxygen lance, the energy of reflected jet, splashing, and cavity formation of the swirl-type oxygen lance was decreased. However, the energy of jet attenuation, slag, and molten steel increased. The energy proportion of the reflected jet was about 8%, while the energy of slag was 15% of molten steel. The maximum energy was transferred from the jet to the slag and molten steel at H = 40de (H is lance height and de is outlet diameter). When the operation pressure increased from 0.8P₀ to 1.2P₀ (P₀ is the designed pressure), the energy of slag and molten steel was increased by 33% and 25.9%, respectively.