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When the current technology measures the height of an island building, the obtained laser point cloud data is of poor quality and the measurement result is not accurate. In order to solve the above problems, a new sea-island building height measurement technique is studied based on the UAV laser radar. UAV automatic control technology is used to make multi-point and multi-angle photo shooting of island buildings. There are two shooting schemes, namely, a linear flight scheme and a surround flight scheme; multiple locations at different locations and different heights of island buildings The ground image control point obtains the feature images of each island area through aerial photography, and uses Smart3D modeling software to complete the modeling, and converts the established 3D model from the image space coordinate system to the geospatial coordinate system to obtain the height of the island building. Compared with the traditional measurement technology, the results show that the calculation accuracy of the island building height measurement technology based on the UAV laser radar is higher than the traditional technology, which has a good promotion effect on island management.