The invention relates to a field driving skill assessment system based on automobile electronic identification and an application method thereof. During the assessment, an ultrasonic sensor acquires the distance from a road fence in real time and transmits to a microwave communication device. The microwave communication device uploads the distance to a control center through a roadside communication unit in real time. The control center determines whether or not a line is crossed to achieve the monitoring of whether a vehicle crosses the line. Compared with an existing method, the present method realize the monitoring of whether an assessed vehicle crosses the line via the ultrasonic distance measurement rather than using a magnet to assist in the monitoring, and the monitoring effect is stable. As no magnet is needed, the cost of maintenance brought by the replacement of the magnet is also saved, the monitoring is realized simply by arranging the road fence and adding the ultrasonic sensor in the vehicle, and the cost is low.