The utility model relates to a quick change platform of a sliding steel-tapping hole mechanism of a 120T converter. The quick change platform is characterized in that a platform body (1) is arranged; a platform main body (2) and a movable platform (3) are arranged on the platform body (1); an electric hoist (4) is mounted at the top of the platform main body (2); the platform main body (2) is made of No 10 channel steel; and the electric hoist (4) adopts a 2T electric hoist. The quick change platform has a relative simple structure, is easy to manufacture, and is convenient to apply; and the mechanism changing time is always controlled within ten minutes, so that the use effect is obvious.