Aiming at the problem that data link UAV is limited by take-off and landing mode and site, endurance time, image accuracy and so on, a network UAV based on 5G network technology is designed. The UAV uses the airborne professional equipment, relying on 5G networking technology, to achieve the beyond visual range remote measurement and controllable--periodic, large-area automatic cruise function. In the experiment of geological disaster emergency analysis, the UAV realized the whole process of data acquisition, analysis, preprocessing, spatial calculation, elevation extraction, positive photography production, modeling and output. Compared with data link UAV, 5G networked UAV processed the characteristics of high data transmission rate, low delay, large data transmission capacity, safety and reliability. The results showed that 5G networked UAV is able to grasp the real-time situation of the targeted area, provide first-hand information for the disaster situation, help the accurate assessment of the disaster situation, improve the management efficiency, improve the inspection means, and assist the headquarters in decision-making and command.