The invention discloses a method for synthesizing a 2-bromo-1,1,2,2-tetrafluoroethyl substituted aryl building block under simple conditions. The method comprises the following steps: based on aniline and 1,2-dibromotetrafluoroethane compounds, by taking a complex taking iridium, ruthenium and other transition metals as a core as a catalyst, preparing various aniline structures substituted by bromotetrafluoroethane at high efficiency, and further performing derivatization on amino, thereby obtaining multiple 2-bromo-1,1,2,2-tetrafluoroethyl aromatic hydrocarbon compounds. The method takes cheap and readily available aniline and derivatives thereof and the dibromotetrafluoroethane as raw materials, and has the advantages of being small in catalyst amount, wide in substrate application range, easy and convenient to operate, high in reaction efficiency and the like, and after the reaction is ended, another bromine atom is well remained. Meanwhile, the products can be easily converted into 1,1,2,2-tetrafluoroethyl bridged compounds, and have very wide and important purposes in the fields of pesticides, liquid crystal materials, molecular imaging and the like.