The utility model relates to a bracket fixed structure, this vertical fixed bearing structure of semi -girder truss bracket sets firmly the bracket on main steel column, fixed bearing structure includes pull rod and first bracket, the pull rod both ends are connected respectively main steel column with on the bracket, first bracket sets firmly on the main steel column, and support the bottom of bracket. The utility model discloses in, pass through the pulling force and the holding power of pull rod and first bracket through the bracket fixed structure, make fixing on main steel column that the bracket can be stable, improved the security and the reliability of construction.