The invention discloses a road-side node based high risk vehicle alerting method employing a V2X network. The main realization mode is utilizing the road side node which has the advantages of high antenna disposition position and large cover range in the Vehicle to X network (hereinafter referred to as V2X), the positions of each vehicle and the surrounding vehicle are obtained through receiving the message of geographical position information in the cover range, and the velocity, the distance, the characteristics of acceleration and deceleration of the vehicle are obtained. The Bayes networkis determined according to the expert experience, and the condition probability between nodes of the Bayes network is determined, the history data is utilized to perform learning, and the Bayes network used for evaluating is finally determined. When the danger probability of a vehicle is higher than the threshold set by the system, the danger level and the danger factor are broadcasted to the vehicle and the surrounding vehicle through the V2X network, and a vehicle device of the vehicle calls attention of the driver to correct through a sound-light alarm.