The invention discloses a multi-plane multi-object emergent search-and-rescue flight path planning method under a cooperation mechanism of unmanned planes and manned planes for the first time. The method comprises following steps: step one, searching a disaster-affected area by multiple unmanned planes to obtain suspected locations, where disaster-affected people stay; step two, based on the suspected locations, planning an optimal flight path for the unmanned planes to search the suspected locations, based on the optimal flight path, and exerting a pre-arranged plan that uses multiple unmanned planes to search the suspected locations to obtain the locations where disaster-affected people stay and number of disaster-affected people; and step three, based on the locations and number of disaster-affected people, planning an optimal flight path for emergent search-and-rescue of multiple manned planes, and based on the optimal flight path, exerting an emergent search-and-rescue pre-arranged plan assisted by multiple manned planes. The method can effectively improve the efficiency and safety of emergent search-and-rescue in mountain areas of China, is suitable for various flight environments in mountain areas, and guarantees the safety of rescue flight.