The invention provides an aryl nitrile derivative and a preparation method thereof. Compared with the prior art, the brand-new preparation method of the polysubstitution aryl nitrile derivative is provided, and a series of new aryl nitrile derivatives are generated and prepared. Compared with other aryl nitrile derivatives, the aryl nitrile derivative prepared through the method has more rings, the structure is more complicated and diversified, and the aryl nitrile derivative can be greatly applied to the fields of natural product synthesis, new drug research and development, organic pesticide and dyestuff synthesis, and the like.