The invention relates to a tetra(diethylamino) zirconium synthesis method, which comprises the synthesis steps of adding diethylamine and an alkane solvent to a three-neck flask in an inert atmosphere, uniformly stirring, dropwise adding normal hexane solution of n-butyl lithium to the reaction flask, and reacting under stirring for 16 hours after dropwise adding; adding solid zirconium tetrachloride to the reaction system, and reacting the reaction system under stirring in the inert-gas protection condition after zirconium tetrachloride is added; removing a reaction solvent under one atmosphere after reaction is finished, carrying out reduced-pressure distillation after the solvent is completely removed, and collecting the distillate of 120 DEG C/0.5mmHg, namely a tetra(diethylamino) zirconium compound. The synthesis process is improved, the reaction operation is simple, and equipment is common; at the same time, single hydrocarbon solvent normal hexane is adopted, so that the cost and reaction toxicity are lowered, the yield is improved and scaled production is facilitated.