The invention mainly relates to preparation of an organic compound with naphtho-seven-membered nitrogen oxygen heterocycle as a core structure and application thereof in an OLED. The compound shown inthe following formula has high glass transition temperature and molecular thermal stability as an OLED luminescent material intermediate, easily forms an amorphous film, has good photoelectric properties, effectively improves the luminous efficiency and prolongs the service life of an OLED device, and has good market application prospects.