The invention discloses an indeno [1, 2-b] indole derivative as well as a preparation method and application thereof, and the preparation method comprises the following steps: mixing a 2-((2-
halogen phenyl) ethynyl)-N, N-
dimethylaniline derivative (II), 2-
diazo-2-phenyl
methyl acetate (III), a
metal palladium catalyst, a
diphosphorus ligand, an acid-base
neutralization additive and a first
organic solvent, and carrying out a
coupling reaction to realize preparation of the indeno [1, 2-b] indole derivative (I) . The preparation method provided by the invention has the advantages of mild
reaction conditions, simple preparation method, high yield and the like, and the prepared product can be used for preparing organic light-emitting devices and ligands.