Reinforced concrete slab-concrete filled steel tubular column connecting joint and construction method thereof

The invention discloses a reinforced concrete slab-concrete filled steel tubular column connecting joint. The joint comprises a vertically arranged concrete filled steel tubular column and a transversely arranged reinforced concrete slab, the concrete-filled steel tubular column is divided into an upper concrete-filled steel tubular column and a lower concrete-filled steel tubular column, a flange plate is arranged at the end of the lower side of a steel tube of the upper concrete-filled steel tubular column, a flange plate is arranged at the end of the upper side of a steel tube of the lower concrete-filled steel tubular column, and bolt holes are formed in the flange plates; a vertical connecting steel bar is welded inside the upper side of a steel pipe of the lower concrete-filled steel tubular column and extends out of the upper side of the lower concrete-filled steel tubular column; transverse flexural steel bars, longitudinal flexural steel bars and reserved holes are arranged in the reinforced concrete