The invention provides a replaceable-type long-life steel tower for fiberglass chimney support. The replaceable-type long-life steel tower comprises a center fiberglass chimney. A plurality of steel angle main materials surround on the periphery of the fiberglass chimney, and each steel angle main material is connected with the fiberglass chimney through a plurality of steel angle auxiliary materials; and the steel angle main materials and the steel angle auxiliary materials are both solid core sectional materials, and the surfaces of the sectional materials are coated with hot galvanizing coatings and anti-corrosion layers. According to the replaceable-type long-life steel tower for fiberglass chimney support, damaged parts can be directly replaced in the long-term use and operation processes, production halting, dismantling, rebuilding and remounting are not needed, waste is avoided, the service life is long, circular replacement can be achieved, and the replaceable-type long-life steel tower has the very good safe, ecological, environment-friendly, economic and social benefits.