The invention discloses a protective fence applied to roads and bridges. The protective fence comprises at least one continuous protection unit arranged in parallel, each protection unit comprises a supporting rod, a connecting rod and a protection baffle, and the angle between the extension line of the advancing direction of the connecting rod and the extension line, extending towards the advancing direction of the connecting rod, of the cross section of the protection baffle is 30-45 DEG. The protection baffle is arranged obliquely to effectively improve the shielding effect of automobile lamps on light rays, a first fixing groove is formed in the top of the connecting rod, a first fixing column is arranged at the bottom of the protection baffle, and the protection baffle and the connecting rod are detachably connected, so when the local protection baffle is damaged, and the local protection baffle can be replaced and maintained, resource waste is effectively avoided; and the multiple protection units are arranged, the protective fence is arranged in a unitization mode, and if the whole protection unit is damaged, the protection unit can be replaced, so resource waste is furtheravoided.