NOVELTY - A vanadium-titanium solar battery comprises light-heat transforming part and heat-light transforming part connected in parallel. The light-heat transforming part is produced by mixing exhaust dreg after vanadium extraction with common ceramic material, adding fiber material, forming the materials into blank plate, drying, and curing or sintering the plate into big hollow vanadium-titanium black ceramic panel. The heat-light transforming part is prepared using strontium titanate as raw material and superfine film technology.    USE - A vanadium-titanium solar battery.    ADVANTAGE - The battery uses raw materials rich in sources, is environment friendly, and has high transformation efficiency.    DETAILED DESCRIPTION - Vanadium-titanium solar battery comprises light-heat transforming part and heat-light transforming part connected in parallel. The light-heat transforming part is produced by:    (A) mixing exhaust dreg after vanadium extraction with common ceramic material, controlling exhaust dreg at 35 wt.%, adding fiber material, and forming the materials into blank plate having thickness of 3.2 mm and projection area of greater than or equal to 0.1 m2 by rolling or semi-pressing;    (B) drying the blank plate, sintering at 1100 degrees C into vanadium-titanium black ceramic panel, keeping 2 panels parallel and distant, installing entrance/exit channels and end plates at 2 ends, and connecting periphery with middle lining with binding agent or sealing them with binding material having sintering temperature lower than the vanadium-titanium black ceramic panel; and    (C) curing or sintering the plate into big hollow vanadium-titanium black ceramic panel, putting glass panel slightly larger than the hollow plate on a fire resisting concave mold, heating the glass panel, pressurizing the glass panel so that it sinks with the mold, preheating the hollow panel and placing it on glass, regulating temperature and pressure so that the glass panel and the hollow plate are connected hermetically, and sealing hollow cavity between the glass panel and the hollow plate.    The heat-light transforming part is produced by:    (A) putting niobium oxide in hydrofluoric acid, agitating the material at 76 degrees C, and dissolving the material uniformly to form niobium oxide solution; adding ammonia into the solution drop by drop to form white niobium hydroxide precipitate, aging the precipitate for 5.5 hours, washing the precipitate with 3.5% diluted ammonia, and dewatering and washing the precipitate in vacuum; and dissolving the dried precipitate in citric acid glycol at 71 degrees C, and agitating the solution uniformly to produce niobium-citric acid glycol solution;    (B) respectively preparing strontium acetate, tetrabutyl orthotita and niobium-citric acid glycol solution, controlling mole ratio of strontium (Sr2+) to titanium (Ti4+) and niobium (Nb5+)) at 1:(1-x):x, in which x is 0.1-0.005, dissolving strontium acetate in acetic acid to form solution (A), adding diacetone into tetrabutyl orthotita, adding ethylene glycol monomethyl ether solvent to form solution (B), mixing and agitating solution (A) with solution (B) uniformly, adding niobium-citric acid glycol solution, agitating the solution uniformly to form mixed solution, adding glycol and glycerol into the mixed solution, controlling ratio of glycol to glycerol at 3.5:1, controlling Sr2+ of the mixed solution to 0.15-0.40 mol/L, and agitating the solution uniformly to form niobium-doped strontium titanate precursor solution; and    (C) coating the niobium-doped strontium titanate precursor solution onto substrate, thermally breaking the substrate, sintering the substrate, and clamping strontium titanate superthin film with thickness of 0.4 nm between 2 insulating strontium titanate to form sandwiched structure.    There are 3-5 layers of film which are installed. The solar battery is of multi-level serial connection. An anode output end of the solar battery is connected with a diode in series.