Steel structure painting device

The utility model relates to the technical field of steel structure painting, in particular to a steel structure painting device which comprises a machine body, a left long rod and a right long rod are arranged in the machine body, the left long rod and the right long rod are both arranged on the machine body, a paint sprayer and a polisher are installed on the left long rod and the right long rod respectively, and the left long rod and the right long rod move reversely. The paint sprayer and the polisher are driven to alternately abut against the to-be-machined material; the driving mechanism is arranged in the machine body and is used for driving the left long rod and the right long rod; and the moving mechanism is arranged on the machine body and used for driving the moving plate. By driving the rotating rod to rotate, the polisher can be firstly driven to abut against a to-be-machined material, the polisher is started, the surface of the to-be-machined material is firstly polished, then the paint sprayer