The utility model provides an oxygen lance quick change device for a converter. A bottom pad is installed on an oxygen lance trolley. The device consists of the bottom pad as well as an oxygen keyway, a water inlet keyway, a water return keyway, a semispherical pit, guide pins, an oxygen lance bracket and the like respectively arranged on the bottom pad. The oxygen keyway, the water inlet keyway and the water return keyway are arranged on one side of the bottom pad in parallel. The guide pins are respectively arranged in the water inlet keyway and the water return keyway. The reversed U-shaped oxygen bracket is arranged on the other side of the bottom pad, and the semispherical pit is arranged on a lower square plate. The device provided by the utility model has the advantages of reasonable structure, simpleness in manufacturing, safety and reliability in use and the like. By applying the device, the oxygen lance can be integrally inserted and changed fast, so that the changing time of the oxygen lance is shortened to 30 minutes from original 5-6 hours. Therefore, not only is the operating time saved, but also the labor intensity of workers is reduced, so that considerable economic benefit is gained for enterprises.