The utility model discloses a steel structure support bracket that is used for at tunnel top arrangement total powerstation, including the layer board of level setting the both sides of layer board respectively are equipped with a connecting plate rather than perpendicular connection, are located two of layer board both sides connecting plate bilateral symmetry sets up, the lower extreme of connecting plate with the layer board welding, the upper end of connecting plate and the lower extreme of lug adoption bolted connection the middle part of layer board is equipped with along the slot hole of tunnel length direction extension. The utility model discloses a structure is pulled to the all steel, has higher intensity and rigidity, can avoid destruction and deformation in the work progress, can establish firm the hanging reliably of total powerstation at the tunnel top, can make the every single move angle of total powerstation adjustable, can make the front and back position of total powerstation adjustable, small, occupation space is little, does not hinder going on of other processes, convenient assembly and disassembly. Repeatedly usable can save material and cost.