The invention relates to a new method and a system for predicting intersection vehicle collision risk based on vehicle and road synergy. The method and the system predict motion state parameters of adjacent vehicles which have travelling intention conflicts in adjacent area range, and through predicting whether a vehicle in neighbourhood would get into a conflict area of a tested vehicle, and closeness degree of the vehicle and the tested vehicle in the conflict area, the method and the system can determine current travelling safety state of the tested vehicle and predict conflict risk degreeof vehicles. The method and the system give full consideration to travelling intentions of drivers of adjacent vehicles and vehicle relative motion states, to predict relative motion trends of the adjacent vehicles. The method and the system improve accuracy of vehicle conflict risk identification under complex road traffic environment, and are easy to implement. The method is low in complexity, and can be widely used in driving simulator, vehicle collision risk early warning, and vehicle safety auxiliary driving system. The method and the system are used to evaluate and predict track crossingof moving vehicles and collision risk.