The invention provides a control method and system of an unmanned aerial vehicle group. The method comprises the following steps that through data collecting equipment of each unmanned aerial vehicle, video images around each unmanned aerial vehicle are obtained, and the topological structure of the unmanned aerial vehicle group and environment point cloud distribution are obtained; according to the topological structure and flying missions, the flying path of each unmanned aerial vehicle is planned; through sensors, flying data of each unmanned aerial vehicle and the distance between adjacent unmanned aerial vehicles are obtained; and according to the flying paths, environment point cloud distribution, the flying data and the distance between adjacent unmanned aerial vehicles, a global map for flying of each unmanned aerial vehicle of the unmanned aerial vehicle group is established, and flying of the unmanned aerial vehicle group is controlled through the global map. According to the method, by generating the global map, the unmanned aerial vehicles are controlled based on obstacles and the flying data of the unmanned aerial vehicles, accordingly, the cooperative work capacity of the unmanned aerial vehicles is improved, and mission completing efficiency is guaranteed.