The invention discloses an operating platform for high-altitude installation of a steel structure. The operating platform comprises a cantilever beam, wherein an interior leg brace and an inner column are arranged in an inner end of the cantilever beam, and are connected with embedded parts; a plurality of outer columns is arranged on an outer end of the cantilever beam; part of outer columns are fixed on an outer side of a shear wall through the embedded parts; the operating platform is arranged on the upper ends of the outer columns; a plurality of outer leg braces is arranged between the operating platform and the cantilever beam; and part of outer leg braces are fixed on the outer side of the shear wall through the embedded parts. The operating platform has a simple structure, and is very convenient to manufacture and use; the construction efficiency is effectively improved; and an applicable range can be enlarged through controlling the embedded parts in a wall body. In addition, the operating platform can be recycled, so that the material waste is avoided.