The invention discloses an aromatic diacid containing terpyridyl and a synthesis method thereof. The diacid containing a terpyridyl unit is a novel aromatic diacid monomer, on one hand, the aromatic diacid containing the terpyridyl unit can be adopted as a novel ligand for synthesizing a metal organic frame (MOF) of the special structure, and an organic-inorganic material is prepared. On the otherhand, the aromatic diacid containing the terpyridyl unit is adopted as a novel monomer, polyester, polyamide and other macromolecular compounds containing terpyridyl units can be prepared, and the compounds can be complexed with many transition metals and rare metals to form macromolecular complexes, so that the macromolecular complexes have the performance of terpyridyl complexes, have the unique magnetic and photophysical and electrochemical properties and also have the excellent thermal performance, mechanical performance and the like of macromolecules.