Aiming at the problems of slow mapping time, high cost requirements, and large field workload in traditional large-scale mapping, a drone mapping scheme suitable for large-scale 1:500 was proposed. GPS-RTK was used for map root control measurement, and DJI's drone data and aerial image data processing software Terre were used for data processing. Cass3D images were used for digital acquisition in indoor mapping, collecting ground feature data, and ultimately completing the drawing of topographic maps. The application in Wuhu Industrial Park shows that the studied unmanned aerial vehicle oblique photography scheme can meet the high-precision 3D mapping of 1:500, and is efficient, low-cost and feasible.