In order to solve the problem of poor modeling effect caused by many shooting blind areas and large differences in image acquisition resolution in complex buildings, a three-dimensional surround photography and fine modeling method of UAV is proposed. A single lens small multi rotor UAV is selected to design a three-dimensional surround image acquisition route according to the appearance of complex buildings, Then import the acquired image into context capture software for analysis and processing, and complete the model establishment. Finally, aiming at the lack of texture, fuzzy drawing and other information in the three-dimensional model, DP modeler and 3ds Max are used to modify the model. Taking two adjacent buildings in a park as the research object, the new method and the traditional UAV tilt photography method are used to carry out comparative experiments from three aspects: modeling efficiency, model accuracy and texture details. The results show that the new method has the advantages of high modeling efficiency, high precision and rich texture, improves the quality and efficiency of complex building modeling, linkage modification solves the problem of lack of information in the process of image acquisition, and significantly improves the quality of model details.