Protection mechanism for road bridge and tunnel engineering construction

The utility model discloses a protective mechanism for road bridge and tunnel engineering construction, which comprises a protective fence body, the protective fence body comprises support columns, support rods, bottom plates and fixing willows, the opposite sides of the support rods are fixedly mounted on the opposite sides of the support columns, the tops of the bottom plates are fixedly mounted at the bottoms of the support columns, and the fixing willows are fixedly mounted at the bottoms of the support columns. The upper side and the lower side of the fixing willow needle penetrate through the upper side and the lower side of the bottom plate, supporting assemblies are fixedly installed on the front side and the rear side of the supporting column, and each supporting assembly comprises a plurality of fixing plates, a stroke groove, a sliding block and an inclined rod. Through the arrangement of the supporting assembly, the pulling mechanism, the positioning mechanism and the positioning groove, the suppo