The invention discloses a synthesizing method of benzophenanthrene dodecyloxy bridging dodecyloxy phenyl porphyrin metal Ni complex. The synthesizing method includes the steps of firstly, generating single-hydroxyl penta-hexyloxy benzophenanthrene; synthesizing alkoxy benzophenanthrene containing an omega-bromine branch; secondly, acquiring porphyrin acid; thirdly, using the intermediates obtained in the first two steps to synthesize an alkoxy bridging porphyrin-benzophenanthrene binary compound through phase-transfer catalysis reaction, and allowing the alkoxy bridging porphyrin-benzophenanthrene binary compound to react with metal salt to obtain the metal complex. The benzophenanthrene which is a common material is good in photochemistry and thermal stability, easy in raw material obtaining, easy to purify, and the like. The metal porphyrin is high in absorption in a visible light area, good in photochemistry and thermostability and mature in synthesizing method. The benzophenanthrene dodecyloxy bridging dodecyloxy phenyl porphyrin metal Ni complex synthesized by the method can be applied to molecular devices such as organic photovoltaic materials, liquid crystal materials, organic solar cells and organic light emitting diodes.