The invention discloses a small molecule luminescent material based on a triple-spiro acridine donor unit, a preparation method and an application thereof, and belongs to the technical field of organic photoelectric materials. The luminescent material of the present invention contains a triple-spiro acridine donor unit, has a single material structure, a certain amount of material, is easy to purify, has good reproducibility in multiple synthesis, and has very high thermal stability and shape stability. The small molecule luminescent material based on triple spiro acridine donor unit of the present invention is applied to organic photoelectric devices, compared with the small molecule electroluminescent material composed of double spiro acridine donor unit, based on triple spiro acridine The donor material can obtain higher horizontal dipole orientation, higher device efficiency and bluer light color, and obtain higher device efficiency in a wider doping ratio, thus having a wider application prospect , for example, higher efficiency can be obtained in non-doped devices, and can be applied to pure delayed fluorescence white light devices, etc.