The utility model discloses an expressway subgrade's soft basic highway section protective structure, including ground, soft basic road surface and protector, soft basic road -surfacing is subaerial, soft basic road surface side bottom is provided with the ground stake through ground, the ground stake is L form setting, the ground stake corresponds the fixed spiral sleeve that is provided with of side on soft basic road surface, protector sets up the both sides on soft basic road surface, protector passes spiral sleeve and ground stake screwed connection through the screw adjusting assembly pole. This expressway subgrade's soft basic highway section protector, it is convenient to install, and barrier propterty is high, and stability is strong, effectively reduces the incidence of soft basic road surface traffic accident.