TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Preparing metal porphyrin-thienothiadiazole organic semiconductor compound, comprises: (a) dissolving 5,7-dibromothieno (3,4-c) (1,2,5) thiadiazole in a first organic solvent; reducing the temperature to -78 degrees C by liquid nitrogen/isopropanol; then dripping n-BuLi; reacting them for 1 to 5 hours at the temperature of -78 degrees C; then adding 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxapentaborane; continuously reacting them for 0.5 to 5 hours at the temperature of -78 degrees C; then naturally ascending the temperature to the room temperature; after reacting for 1 to 48 hours, obtaining 5,7-di (4,4,5,5-tetramethyl-1,3,2-dioxapentaborane) thieno (3,4-c) (1,2,5) thiadiazole; (b) dissolving dipyrrylmethane, a first silicon fluorine derivative and a second silicon fluorine derivative in a second organic solvent containing an oxidant and a first catalyst; reacting them for 1 to 24 hours at the temperature of 20 to 100 degrees C to obtain a silicon fluorine porphyrin derivative; (c) adding the silicon fluorine porphyrin derivative and a brominating agent to a third organic solvent in the molar ratio of 1:2 to 1:5; reacting them for 1 to 72 hours at the temperature of 0 to 120 degrees C to obtain a dibromo silicon fluorine porphyrin derivative; (d) dissolving the dibromo silicon fluorine porphyrin derivative to a fourth organic solvent; then adding solution containing the M metal ion; stirring them for 0.5 to 24 hours at the temperature of 0 to 30 degrees C to obtain a dibromo silicon fluorine metal porphyrin derivative, where the molar ratio of the dibromo silicon fluorine porphyrin derivative to the M metal ion is 1:1 to 1:5; and (e) in the anaerobic environment, dissolving the dibromo silicon fluorine metal porphyrin derivative and the 5,7-di(4,4,5,5-tetramethyl-1,3,2-dioxapentaborane) thieno (3,4-c) (1,2,5) thiadiazole to a fifth organic solvent containing a second catalyst in the molar ratio of 1:2 to 2:1; carrying out Suzuki coupling reaction for 12 to 72 hours at the temperature of 50 to 120 degrees C to obtain the metal porphyrin-thienothiadiazole organic semiconductor compound. Preferred Components: The first organic solvent is at least one of tetrahydrofuran, ether and dioxane; and the molar ratio of the 4,7-di (tributyl tin)-2,1,3-thienothiadiazole to tri-n-butyl tin chloride is 1:1-10. First catalyst is propionic acid or trifluoroacetic acid; the oxidant is dichlorodicyanobenzoquinone; and the second organic solvent is one or two of trichloromethane and dichloromethane. The brominating agent is N-bromosuccinimide; and the third organic solvent is at least one of tetrahydrofuran, chloroform, dimethyl acetamide and orthodichlorobenzene. The fourth organic solvent is at least one of dichloromethane, trichloromethane, tetrahydrofuran, benzene, and toluene. Second catalyst is organic palladium, or a mixture composed of the organic palladium and organic phosphorus ligand; the molar amount of the second catalyst is 0.01 to 20% of the molar amount of 5,7-di(4,4,5,5-tetramethyl-1,3,2-dioxapentaborane) thieno (3,4-c) (1, 2,5) thiadiazole; and the fifth organic solvent is at least one of tetrahydrofuran, dichloromethane, chloroform, dioxane, dimethyl acetamide, glycol dimethyl ether, dimethyl sulfoxide, benzene, chlorobenzene and toluene. The organic palladium is Pd2(dba)3, Pd(PPh3)4, Pd(OAc)2 or Pd (PPh3)2Cl2; the organic phosphorus ligand is P(o-Tol)3 and tricyclohexyl phosphine; and the molar ratio of the organic palladium to the organic phosphorus ligand in the mixture composed of the organic palladium and the organic phosphorus ligand is 1:1-20. Preferred Definition:    M=Zn2+, Cu2+, Fe2+, Co2+, Cd2+, Pt2+, Zr2+, Mn2+, Ni2+, Pb2+ and Sn2+.