The invention discloses a vehicle road early warning system for improving the traffic safety in a fog region of a highway. The system comprises an early warning control unit, a plurality of traffic induction units, visibility detection units, a plurality of short-range communication modules and the like, wherein the traffic induction units, the visibility detection units, short-range communicationmodules and the like are arranged on stand columns of crash barriers of the highway along a line. A vehicle position identification unit is in communication with the early-warning control unit through remote communication and distribution of satellites and the short-range communication modules on the highway so as to ensure the communication effect. According to an output result of the early-warning control unit, a driver is prompted to run safely through the traffic induction units and the vehicle-mounted vehicle position identification unit. For vehicle driving in a fog region of the highway, the safety operability and guidance of the driver can be improved, the potential safety hazard of the vehicle driving under low visibility can be effectively reduced, and safe driving of the highway can be guaranteed; and meanwhile, vehicles on lanes can be guided in real time, so that the traffic efficiency of the highway is fully exerted to the maximum extent, and the safe and efficient development of a highway traffic system are promoted.