The invention discloses a protective net steel column. The problem that an existing steel column is likely to lose stability and be bent is solved. The protective net steel column comprises a cylindrical column body, a column bottom plate and a column top plate, wherein the column bottom plate and the column top plate are arranged at the two ends of the column body. Two parallel column bottom lug plates are arranged on the side, away from the column body, of the column bottom plate. A gap exists between the two lug plates. A column bottom casing pipe with the two ends connected with the two column bottom lug plates is arranged between the two column bottom lug plates. An arc-shaped bolt is arranged on the side, away from the column body, of the column top plate and fixed to the column top plate through a nut. By the adoption of the protective net steel column, a cylinder is adopted as the steel column body, under the condition of the same sectional area, the stability of the steel column can be effectively improved, and therefore the performance of a whole protection system is improved.