NOVELTY - Block polymer is dissolved in ethyl alcohol, concentrated hydrochloric acid and diacetone are added, mixed, titanium precursor solution and deionized water are added and mixed to obtain titanium precursor sol. Titanium dioxide nanometric microspheres is added to titanium precursor sol and dispersed to obtain microsphere titanium precursor composite sol. The composite sol is formed into film on conductive glass, annealed and cooled. The spin-coating process is repeated for multiple times, annealed and cooled, to obtain photoelectrode of nano-crystalline solar cell.    USE - Preparation of photoelectrode used for nano-crystalline solar cell.    ADVANTAGE - The photoelectrode having high specific surface area and excellent light scattering property is manufactured easily, and provides improved open circuit voltage, short circuit current density and photoelectric conversion efficiency to nano-crystalline solar cell.    DETAILED DESCRIPTION - Block polymer (1-3 g) is made to dissolve completely in absolute ethyl alcohol (15-30 ml), concentrated hydrochloric acid (1-3 ml) and diacetone (0.2-1.0 ml) are dripped, mixed for 30 minutes, titanium precursor solution (5-15 ml) is dripped into the obtained solution under stirring condition for 30 minutes, deionized water (0-1 ml) is added, and mixed at room temperature for 0.5-6 hours to obtain titanium precursor sol. Titanium dioxide nanometric microspheres with size of 200-800 nm is added into the titanium precursor sol, and the sol is dispersed for 20-60 minutes using ultrasonic such that titanium dioxide microspheres are fully dispersed in the sol uniformly to obtain microsphere titanium precursor composite sol. The content of titanium dioxide nanometric microsphere in the sol is 0.5-20 %mass. The composite sol is enabled to form a film by spin-coating method on fluorine-doped tin oxide conductive glass at rotating speed of 1000-3000 rpm for 20-60 seconds, the fast thermal process is carried in fast annealing furnace, annealed at 400-500 degrees C for 5-30 minutes in presence of air and naturally cooled to room temperature. The spin-coating process is repeated for multiple times in order to obtain titanium dioxide thick film with thickness of 100 nm to more than 10 micron, thermal process is carried out on titanium dioxide thick film at 400-500 degrees C for 1-6 hours and naturally cooled to room temperature, to obtain photoelectrode of nano-crystalline solar cell.