The invention discloses a fused heterocyclic compound and application thereof. The fused heterocyclic compound has a structure shown in a formula (I), a parent nucleus is formed by bonding three arylene groups or heteroarylene groups to a benzene ring, and the parent nucleus and an adjacent layer have a matchable LUMO energy level. The fused heterocyclic compound is used as a p-doped material in ahole transport layer to be applied to an OLED device, the generation of the holes is promoted, and the electrons and the holes are recombined more effectively to form the excitons in the OLED device,so that the obtained OLED device has the lower driving voltage, higher carrier combination rate and higher luminous efficiency, the parent nucleus is of a rigid structure, it is guaranteed that the compound has the good thermal stability, and the service life of the device is prolonged. The invention also provides an application of the fused heterocyclic compound as an organic electroluminescentmaterial.