The continuous development and improvement of unmanned aerial vehicle (UAV) technology have made it increasingly widely used in various fields such as cultural relic protection and municipal road construction. How to utilize new technologies to achieve efficient management of construction sites is one of the key challenges faced by the supervision industry. This paper focuses on the integrated application of UAV technology and the Cloud Earth platform, exploring its practical path in supervision management. Taking a district-level cultural relic building renovation project as a case, it elaborates on how multi-angle aerial photography by UAVs is used to collect image data on building damage and structural features, and how the Cloud Earth platform is utilized for 3D modeling to achieve precise control over construction progress, quality, and safety, as well as the establishment of digital archives. The paper also verifies the 1 cm modeling accuracy of the 3D model through field measurements. The research indicates that this technology integration can enhance the efficiency and accuracy of supervision work, assist in progress deviation analysis, engineering quantity measurement, and rectification supervision, providing new ideas for the intelligent development of supervision.