A vehicle group management method is provided. In a coverage area of a Road Side Unit, it is determined by the RSU or a designated vehicle whether state information of a plurality of vehicle groups meets a first preset condition for integrating the vehicle groups or a second preset condition for splitting the vehicle groups. The designated vehicle has a management right for managing the vehicle groups. If the determination result is yes, the vehicle groups are integrated according to the first preset condition, or the vehicle groups are splitted according to the second preset condition. Additionally, a vehicle in the integrated vehicle groups or the split vehicle groups is designated as the designated vehicle.