A special section safe driving auxiliary method based on vehicle and road synergy comprises the following steps that firstly, a road side unit periodically broadcasts special section information to vehicles within a communication covering range; secondly, whether the environment brightness is lower than a first preset value or not is detected; thirdly, vehicle state information within a road side unit range and a covering rage of a special section are acquired; fourthly, whether the driving direction of a vehicle and the direction of the special section to be entered are identical or not is judged; fifthly, a driver of the vehicle is reminded that he/she will enter the special section; sixthly, the driver of the vehicle is reminded to correctly use headlamps; seventhly, whether the speed of the vehicle exceeds the limiting speed or not is correspondingly judged according to the type of the vehicle; eighthly, whether the headlamps are used correctly or not is judged; ninthly, whether the vehicle pulls out of the special section or not is judged. At the vehicle and road synergy information interaction state, the section information is given in advance, whether the vehicle enters or leaves the special section is accurately judged, early warnings in forms of word, voice and the like are given when the vehicle is driven to the special section, and the user experience is improved.