The invention discloses a road and bridge protective guard, and mainly relates to the technical field of roads and bridges. The road and bridge protective guard comprises a plurality of guard bar units which are connected successively, wherein each guard bar unit comprises a lower supporting tube and an upper supporting tube; a plurality of stand columns are arranged between each upper supportingtube and the corresponding lower supporting tube; an upper supporting shaft is arranged on the top of each stand column; an upper impeller is arranged on each upper supporting shaft; a lower supporting shaft is arranged on the bottom of each stand column; a lower impeller is arranged on each lower supporting shaft; an arc-shaped supporting plate is arranged on one side of each stand column; a brush is arranged on the side, which is close to the corresponding stand column, of each arc-shaped supporting plate; supporting legs are separately arranged at two ends of the bottom of each lower supporting tube; and a base is arranged on the bottom of each supporting leg. The road and bridge protective guard has the beneficial effects that rotatable stand columns are adopted, the stand columns canbe cleaned automatically, the working intensity of maintenance personnel can be relieved, cleanness and tidiness of a city can be ensured, the road and bridge protective guard can be away when impacted or scratched, and injury to the road and bridge protective guard and vehicles can be relieved.