The invention discloses a synthetic method of benzophenanthrene dodecyloxy bridged methoxycarbonyl phenyl porphyrin metal Zn complex. The synthetic method comprises the following three parts: the first part including firstly synthesizing dipyrrole and then synthesizing porphyrinate so as to obtain porphyrin acid; the second part including generating monohydroxy pento(hexyloxy) benzophenanthrene, and then synthesizing alkoxy benzophenanthrene having one [omega]-bromine branched chain; and a third part including using the intermediates obtained from the two parts to synthesize benzophenanthrene decyloxy bridged methoxycarbonyl phenyl porphyrin ternary compound, and reacting the ternary compound with metal salt to obtain a metal complex. The benzophenanthrene derivative is excellent in optical property and thermal stability. The raw materials for synthesizing the ternary compound are available and the product is easy to be purified. The porphyrin derivative is stable in molecule property and structure and is good in fluorescence and aromaticity, and the synthetic method is mature. According to the synthetic method, a benzophenanthrene derivative is connected to a porphyrin derivative through a flexible bridged chain to form benzophenanthrene dodecyloxy bridged methoxycarbonyl phenyl porphyrin metal Zn complex that can be applied to molecule devices, such as organic solar cells, organic photovoltaic materials and liquid crystal materials.