This UAV only needs to be observed and remotely controlled by a pilot on the ground, avoiding the risk of manual inspection and improving the safety of the operation. Meanwhile, based on Li DAR technology, it can smoothly fly autonomously in indoor and underground environments without GNSS data information, and can comprehensively scan the top, bottom and surface of indoor and tunnel areas without dead corners. Build HD model image data. In addition, the whole UAV is equipped with a cage anti-collision structure, which effectively guarantees the safety of the UAV during flight, and can be used in a variety of environments such as highway tunnels, tunnel passages, and indoor environments.