The invention discloses a boron-containing five-membered heterocyclic compound and an application thereof to an organic light-emitting device. The compound takes a benzo five-membered ring as a core,boron is positioned at the center five-membered ring, and the compound has the advantages that molecules are not easily crystallized or gathered, and the compound has a good film-forming property. When the compound is used as a luminous layer material of the organic light-emitting device, the current efficiency, the power efficiency and the external quantum efficiency of the device can be greatlyimproved, and the service life of the device is obviously prolonged.