GIS foundation surface embedded part flatness control structure and construction method thereof

The invention provides a GIS foundation surface embedded part flatness control structure and a construction method thereof. The GIS foundation surface embedded part flatness control structure comprises a reinforced concrete structure layer and a fine aggregate concrete leveling layer, wherein the fine aggregate concrete leveling layer is located on the upper part of the reinforced concrete structure layer; the reinforced concrete structure layer and the fine aggregate concrete leveling layer are arranged on a GIS foundation; bottom plate reinforcing steel bars are laid in the reinforced concrete structure layer, screws are fixed to the bottom plate reinforcing steel bars and fixedly connected with leveling mechanisms through leveling nuts, the leveling mechanisms are arranged in the fine aggregate concrete leveling layer, the leveling mechanisms are fixedly connected with fasteners, and the leveling mechanisms are connected with embedded parts; and the lower portions of the leveling mechanisms are filled with