The invention discloses a benzimidazole ketone compound and an application of the compound on an organic light emitting diode (OLED) device. The compound takes benzimidazole ketone as a core and has the characteristics of difficult intermolecular crystallization, difficult intermolecular aggregation and good film-forming property. When the compound is used as a main material of a light emitting layer of the OLED device, the current efficiency, the power efficiency and the external quantum efficiency of the device are greatly improved; and the service life of the device is obviously prolonged.