The invention discloses a central vertical column of a steel structure house. The central vertical column comprises a contact plate, four-way tubes, rotating devices, supporting rods, connecting ports, a steel column and a bottom plate, and the bottom of the contact plate is provided with the steel column; the steel column and the contact plate are connected in a welded mode, and the four-way tubes are arranged on the two sides of the top of the steel column and are internally provided with the rotating devices; the outer sides of the four-way tubes are provided with the connecting ports, andthe outer sides of the connecting ports are provided with the supporting rods; the bottom of the steel column is provided with the bottom plate, and the bottom plate is connected with the steel columnin a welded mode; and the bottoms the four-way tubes are provided with fixing devices, the top of the contact plate is provided with an anti-abrasion layer, thread plates are arranged on the two sides of the surface of the bottom plate and are in inlaid connection with the bottom plate, and bolts are arranged on the top sides of the thread plates. The central vertical column of the steel structure house is used for building house construction, the problems that four-way tubes of an existing steel structural central vertical column cannot rotate freely, are inconvenient during using, and cannot be applied to various house engineering are mainly solved, and the central vertical column of the steel structure house is simple in structure and easy to achieve.