The present disclosure provides a benzo diheterocyclic compound having a structure represented by Formula (I). In Formula (I), Y1 and Y2 are oxygen or sulfur; Ar1 and Ar2 are each independently selected from a group consisting of single bond, a substituted or unsubstituted phenyl, a substituted or unsubstituted naphthyl, a substituted or unsubstituted anthracyl, a substituted or unsubstituted phenanthryl, a substituted or unsubstituted acenaphthylenyl, and a substituted or unsubstituted aromatic heterocyclic group; m and n are integers independently selected from 0 and 1; D1 and D2 are aryl or heteroaryl, Ar3 and Ar4 are aryl or heteroaryl, and R1 is hydrogen, phenyl, or naphthyl. When the benzo diheterocyclic compound is used as a capping layer of a cathode, it will not interfere light emission of an OLED, and the OLED can maintain a high color purity.