The invention relates to a method for manufacturing dye-sensitive cell photoanode material through high loss diatom opal. The porousness of the diatom opal, the photoelectric activity of TiO2 and thebiomass adhered in the high loss diatom opal are organically combined so as to prepare the low-cost and high-activity DSSC photoanode material. Firstly the biomass deposited on the surface of the diatom opal is reduced to a porous carbon-containing precursor in an in-situ way through reduction calcining, and then inorganic titanium salt is introduced to react with the surface active component of the carbide diatom opal so that the crystallization degree, the dispersiveness and the adhesion soundness of the TiO2 nanocrystals can be improved. The method is simple in production technology, low inequipment requirement, easy to realize industrial production, low in raw material cost and high in environmental suitability and the obtained photoanode material has high cost performance and dye saturation adsorption quantity so that the short circuit current and the efficiency of the dye-sensitive solar cell can be substantially enhanced.