The invention discloses a synthetic method of a benzophenanthrene hexaalkoxy bridged dodecaalkoxy phenyl porphyrin metal Ni complex. The synthetic route of the synthetic method of the benzophenanthrene hexaalkoxy bridged dodecaalkoxy phenyl porphyrin metal Ni complex comprises the following steps of, in a first part, generating monohydroxy pentahexyloxy benzophenanthrene, and subsequently, synthesizing alkoxy benzophenanthrene containing one omega-bromine branch; in a second part, obtaining porphyrin acid; in a third part, making an alkoxy bridged porphyrin-benzophenanthrene binary compound, which is synthesized by using intermediates obtained in the above two parts and through a phase transfer catalytic reaction, react with a metal salt to obtain the metal complex. Benzophenanthrene is used as one common material, and as the benzophenanthrene has the advantages that the photochemical and thermal stability is favorable, a raw material is easily obtained, a product is easily purified, and the like, and metal porphyrin has strong absorption in a visible-light region and good photochemical and thermal stability and is further mature in synthetic method, the benzophenanthrene hexaalkoxy bridged dodecaalkoxy phenyl porphyrin metal Ni complex obtained by synthesis can be applied to molecular devices of an organic photovoltaic material, a liquid crystal material, an organic solar cell, an organic light emitting diode and the like.