The invention discloses a preparation method of the gel electrolyte of a dye-sensitized nanocrystalline solar cell, and relates to a preparation method of gel electrolyte applied to a dye-sensitized nanocrystalline solar cell. The method adopts a mode of doping organic fused salt and nano tin oxide gel, and comprises the following steps of: reacting the low-molecular weight polyethylene oxide with difluoro sulfoxide to generate fluoro polyethylene oxide; reacting the fluoro polyethylene oxide with 1-methylimidazole in N,N-dimethyl formamide to obtain fused salt of which the anion is fluorine ion; preparing nano tin oxide gel; and mixing the fused salt and the nano tin oxide gel, and performing aging and purification to obtain stable gel electrolyte. The gel electrolyte prepared by the preparation method has the same performance as liquid electrolyte and high stability, high electric conductivity and long service life. The method disclosed by the invention plays an important role in the field of preparation of the dye-sensitized solar cell, and has a broad application prospect.