The invention relates to a styrenic quaternary carbon compound and a preparation method thereof. The general structural formula of the styrenic quaternary carbon compound is (img file='dest_path_image002. TIF'wi='86'he='122'/), wherein R1 is C1-C8 alkyl chain or aromatic group and R2 is the substituent group of OMe and CF3. The reaction of the styrenic quaternary carbon compound and the preparation method thereof is the catalytic-reduction coupled reaction of metallic nickel, wherein the reducing agent is the environmentally friendly Zn powder and the catalyst is nickel bromide glycol dimethyl ether (NiBr2. glyme) which has the advantage of low cost and stable valence. The reaction condition has the advantages of being mild, being simple to operate, having good acceptability for functional groups and higher productivity as well as producing no-isomerized by-products of tertiary halogenated substrates.