TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation: The preparation method of the polymer solar battery with inversion structure comprises: (a) cutting indium tin oxide (ITO) glass and placing in the beaker; ultrasonically cleaning with acetone, ethanol, and deionized water for 15-20 minutes; blowing with dry nitrogen and placing in the culture dish; (b) forcedly mixing 10-20 ml of tetrabutyl titanate at 25 degrees C; dropping in the 90-100 ml of absolute ethyl alcohol; dropping 10-20 ml of glacial acetic acid; mixing for 20-30 minutes to obtain the uniform transparent straw yellow solution; adding 10-20 ml of acetylacetone and mixing for 20-30 minutes; slowly dropping 10-20 ml of deionized water to the solution at 2-4 ml/minute, and continuously mixing for 1-2 hours to obtain the uniform transparent straw yellow sol; and aging at 6-8 hours; coating the aged sol on the dried ITO glass to prepare the titanium dioxide (TiO2) film; where the coating speed is 2000-5000 rotations/minute; placing the ITO glass with TiO2 film in the muffle and baking at 450-550 degrees C for 2-3 hours; closing the power, naturally cooling the film with the furnace to the normal temperature; preparing the nanocrystal TiO2 film on the ITO; where the thickness of film is 25-50 nm; (c) dissolving poly(3-hexylthiophene) (P3HT) in the organic solvent dichlorobenzene at normal temperature and preparing the 15-25 mg/ml of solution; mixing at 500-1000 rotations/minute for 12-24 hours; adding (6,6)-phenyl C61 butyric acid methyl ester (PCBM) with the same mass of P3HT to the solution and mixing at 1000-1000 rotations/minute for 36-48 hours to prepare the oly(3-hexylthiophene):(6,6)-phenyl C61 butyric acid methyl ester (P3HT:PCBM) mixed solution with a mass ratio of 1:1; (d) coating the P3HT:PCBM mixed solution on the nanocrystal TiO2 film at 700-1000 rotations/minute; placing the sample in the vacuum oven; annealing at 150-180 degrees C for 30-60 minutes; forming P3HT:PCBM active layer on the TiO2 film; where the thickness is 200-300 nm; (e) taking the sample out and placing in the DS40OB multisource temperature-controlling organic gas-phase molecular deposition system; growing a copper phthalocyanine (CuPc) film on the P3HT:PCBM active layer at the pressure of 1x 10-4 Pa to 9x 10-4 Pa; where the thickness is 1-15 nm; and the growing speed is 0.5-1 A/second; and (f) using the strip mask in the DS40OB multisource temperature-controlling organic gas-phase molecular deposition system; evaporating the strip gold (Au) electrode on CuPc film at the pressure of 1x 10-3 Pa to 9x 10-3 Pa; where the growing speed is 1-2 A/second. Preferred Composition: The thickness of the ITO liner cathode is 50-100 nm. The thickness of the TiO2 teleportation layer is 25-50 nm. The thickness of the P3HT:PCBM active layer is 200-300 nm. The thickness of the CuPc hole transport layer is 1-15 nm. The thickness of Au anode layer is 50-80 nm. A polymer solar battery with inversion structure comprises an indium tin oxide liner cathode, titanium dioxide teleportation layer, a poly(3-hexylthiophene):(6,6)-phenyl C61 butyric acid methyl ester active layer, a copper phthalocyanine hole transport layer, and a gold anode layer; where the gold anode layer is a strip structure.