Digital twin technology integrates a variety of information technologies, provides technical support for virtual reality and computer simulation, and it is also a necessary condition for human beings to establish a virtual world in the future. As a port of departure and landing, the airport has always been regarded as the gateway of a city or even a country. Therefore, by establishing a virtual airport based on digital twin technology, it can not only provide more intuitive and efficient working mode for airport managers and flight support personnel, but also provide more service experience for passengers. The technical concept and establishment mode of digital twin airport, and the business application scenarios of digital twin technology is expounded and analyzed in flight guarantee operation, passenger travel service, security emergency treatment and so on, so as to provide a theoretical basis for the relevant research and application of digital twin airport.