The invention discloses an alpha,alpha-difluoroallyl aromatic hydrocarbon compound containing total carbon quaternary carbon center and a preparation method thereof. N-methoxy benzamide compound, sodium acetate, dichloropentamethyl cyclopentadienylrhodium(III) dimer and 1,1-difluoroallenes are sequentially added to a reaction flask containing a solvent, and then react under stirring at room temperature. After the reaction is completed, the alpha,alpha-difluoroallyl aromatic hydrocarbon compound containing total carbon quaternary carbon center is separated by silica gel column chromatography. As that preparation method of the invention has mild reaction condition, simple operation, raw materials adopted are low in cost, simple and easy to obtain, and tedious pre-functionalization steps areavoided, the substrate has wide application range. The alpha,alpha-difluoroallyl aromatic hydrocarbon compound prepared by the preparation method can be used as a class of novel alpha,alpha-difluoroolefin compounds containing total carbon quaternary carbon center with novel structures, and the difluoroolefin compounds have a broad application prospect in the research and development of drugs and materials.