The TSU-3 mining tunnel inspection drone is built based on advanced real-time 3D positioning and 3D modeling technology. In complex environments without GPS, the drone can still have a long endurance, automatic obstacle avoidance function, and can autonomously complete flight inspection tasks. During the inspection process, the drone can perform real-time 3D modeling and transmit the captured images back in real-time. This mine tunnel inspection drone can be used for inspection work in difficult to reach or dangerous scenarios such as goaf, underground mine tunnels, chutes, and tunnels.