In order to explore a time-saving, labor-saving and efficient and accurate construction monitoring method, the method of project construction progress monitoring based on UAV 3 d modeling is proposed. The coordinates of three-dimensional real scene model and BIM model are converted into the unified coordinate system, and import MicroStation and platform to realize the precise integration of three-dimensional real scene model and BIM model; then based on MicroStation platform, and a construction progress analysis plug-in is developed to realize the matching, segmentation and calculation of three-dimensional real scene model and BIM model, reflecting the actual construction progress with the ratio of completed component volume to the total volume of BIM component, so as to realize the automatic monitoring of project construction progress. The results show that the construction progress of the first to eighth span is higher than 90%; the concrete for the transverse connection of the ninth to fourteenth span girder is not poured, and the construction progress is less than 90%. The construction progress of the first seventh and ninth and tenth main girder on the right side of the bridge is above 97%; the construction progress of the first to seventh main girder on the right side is higher than 95%.