Basement outer wall hanging formwork structure and construction method thereof

The basement outer wall suspended formwork structure comprises a bottom plate and a basement outer wall vertically protruding out of the bottom plate, first formworks and second formworks are reinforced on the two sides of the basement outer wall, the first formworks abut against the corners of the basement outer wall and the bottom plate, the second formworks are arranged on the periphery of the first formworks, and the bottom plate is arranged on the bottom plate. A row of first reinforcing steel bars are welded to the reinforcing steel bars of the basement outer wall at equal intervals and are perpendicular to the reinforcing steel bars of the basement outer wall, the length of the first reinforcing steel bars is larger than the thickness of the basement outer wall, and the tops of the first reinforcing steel bars are flush with the top of the bottom plate. After the first formwork and the second formwork are reinforced through the three-section type water stop screws, concrete can be fully vibrated, and t