The invention provides a novel organic electroluminescent compound and a preparation method thereof. The compound is synthesized by connecting heterogeneous functional groups to 2,7 positions of spirofluorene xanthene as a center unit, and has a structure represented by a general formula in the specification; and in the general formula, R represents a secondary amino group, a pyrryl group, an indolyl group, a carbazyl group, a benzimidazolyl group, or derivative groups of the above groups. The compound is synthesized through a one-step method, the synthesis method is simple, the above prapred micro-molecular compound luminescence material has a good dissolvability, and the organic electroluminescent compound emits blue light, and can be used in luminescent materials, so the compound is hopeful to be used for making efficient organic light-emitting diode devices, and can be widely used in organic electrical storage devices, organic solar batteries, organic laser diode devices and organic field effect transistors.