The invention relates to a pyrimidine-ring-contained palladium metal ligand and a preparation method thereof, belonging to the field of organic synthesis. The pyrimidine-ring-contained palladium metal ligand has a general formula which is shown in the specification, wherein the dotted portion is R; R is aryl or ferrocenyl, R1 is phenyl, ring ethyl, ethyl, propyl, or butyl, and Aryl is aryl or heterocyclic group, and X is selected from Cl-, Br- and I-. The preparation method of the pyrimidine-ring-contained palladium metal ligand comprises the following steps of: mixing halogenated pyrimidine ground ring single palladium adduct, Aryl-B(OH)2, alkali and organic solvent; heating and refluxing under the protection of inert gases; adding water after refluence; and then, adding an organic solvent to extract products to obtain a pyrimidine-ring-contained palladium metal ligand. The halogenated pyrimidine ground ring single palladium adduct has a general formula which is shown in the specification, wherein the dotted portion is R; the X1 is Cl-, Br- or I-. The method avoids the direct reaction between a multidentate ligand and a palladium source, avoids adding an additional palladium catalyst in a reaction process, has low requirements for reaction conditions, high yield and stable products and can be used for preparing ring-palladium polynuclear metal compositions.