In view of the problems of long construction period and low precision in traditional three-dimensional modeling, it has been unable to meet the development needs of smart city construction. Based on UAV tilt photogrammetry technology, this paper carries out three-dimensional real scene modeling of Zhongdu ancient town. The results show that the threedimensional model of Zhongdu ancient town constructed by UAV oblique photogrammetry technology is realistic, rich in texture and has high accuracy, which greatly reduces the cost of three-dimensional modeling and effectively improves the efficiency of model production, and provides important technical support for the construction of ' smart city '.