The invention discloses a converter lintel girder replacing method, and belongs to the technical field of equipment installation maintenance. The converter lintel girder replacing method is capable ofmoving converter lintel girders through narrow gaps, and comprises following steps: A, a rotating rope is arranged right above a converter lintel girder; B, a hoisting equipment is used for hoistingthe converter lintel girder, wherein the peripheral direction of the converter lintel girder is designed to be upward, and the rotating rope is designed to be inclined; D, the hoisting equipment is used for lowering, the converter lintel girder is suspended using the rotating rope, automatic swing of the rotating rope is realized, and the converter lintel girder is driven to rotate; E, the above steps are repeated until the converter lintel girder is driven to rotate to a position so that the converter lintel girder is capable of passing through a gap between two factory square pillars; F, theconverter lintel girder is dismounted through the gap between the two factory square pillars; G, a new converter lintel girder is installed through passing through the two factory square pillars; andH, the former step is adopted to drive the novel converter lintel girder to rotate along an opposite direction to an installation direction; and I, the converter lintel girder is laid down.