The invention discloses a synthetic method of a 4,6-di(diphenylphosphine)phenazine compound and belongs to the field of organic synthesis. In an anhydrous and oxygen-free atmosphere, bis(2-diphenylphosphinephenyl)ether is used as a raw material to react with sodium azide, and 4,6-di(diphenylphosphine)phenazine is synthesized through azidation/intramolecular C-H ammoniation. The synthetic method has advantages of few reaction steps, mild reaction condition, simple operation and high yield, greatly promoting the application of the compound in the field of catalysis.