The invention discloses a system for controlling automatic car-following operation and a method thereof. The system comprises a piloting-car control system and following-car control systems, wherein the piloting-car control system is arranged on a piloting car, and the following-car control systems are arranged on following cars and communicate with the piloting-car control system. The piloting-car control system collects related data about the piloting car through a plurality of sensors and a GPS positioning device which are arranged on the piloting car, and sends the data to the following car through a car-car communicator. Each following-car control system receives the data based on a car-car communicator and collects data through a plurality of sensors, a GPS positioning device, a radar, a camera and the like which are arranged on the following car, and then controls automatic car-following driving of the following car according to the data. Multi-data is integrated to judge the following situation of the following car so that the safety and the reliability of automatic driving can be ensured effectively.