A dynamic track planning algorithm for disaster detection UAVs was proposed. When a major disaster such as an earthquake or flood, in order to obtain the disaster environment information for the first time, the UAV portable detection device can be used to detect the disaster ready information and images, and the information can be transmitted in real time. A dynamic track planning algorithm based on the framework of cultural algorithm was proposed. Firstly, the model was constructed for different terrains in the environment, and the corresponding function model was designed for obstacles such as mountains and peaks, and a digital map was constructed. The dynamic track planning was performed on the map model. The flight path planning algorithm can make the UAV independently plan the flight path during the flight process, realize ultra-low altitude flight, make the information collection more accurate, and effectively assist the rescue strategy. It was proved that the feasibility and effectiveness of the algorithm were verified by simulation and comparison with various algorithms.