NOVELTY - Preparation of solar battery involves preparing mixing material comprising dodecyl trimethoxy silane coupling agent, absolute ethyl alcohol, deionized water, and silicon dioxide nanometer particle; mixing polyethylene glycol and polyfluorotetraethylene-hexafluoropropylene high molecules into organic solvent of carbonic allyl ester polycarbonate/glycol dimethyl ether; adding the prepared mixing material into high molecules mixing material; and adding iodine/lithium iodide oxidation reduction electrode pair into macromolecular solution.    USE - Method for preparing modified polymer electrolyte dyestuff sensitization nanocrystalline solar battery.    ADVANTAGE - The method is capable of increasing the efficiency of open-circuit voltage and solar battery.    DETAILED DESCRIPTION - Preparation of solar battery involves:    (A) preparing mixing material by adding dodecyl trimethoxy silane coupling agent of formula C12H25Si(OCH3)3 (0.1-0.6 g) into absolute ethyl alcohol (2-5 ml); deionized water (0.05-0.15 g), adding silicon dioxide nanometer particle (0.01-0.2 g), continuously stirring for 5-24 hours, and condensing with surface hydroxy of silica nanometer particle and coupling to its surface;    (B) mixing polyethylene glycol (PEO) and polyfluorotetraethylene-hexafluoropropylene (P(VDF-HFP)) high molecules at weight ratio of 1:4-4:1 into organic solvent of carbonic allyl ester polycarbonate (PC)/glycol dimethyl ether (DME), in which the total weight of PEO and P(VDF-HFP) high molecules is 2-10% of that of organic solvent;    (C) adding PC as high molecules-class plasticizing agent, in which the volume ratio of PC and DME is 1:8-8:1;    (D) adding the prepared mixing material in step (a) into high molecules mixing material after stirring under 60-100 degrees C for 2-6 hours continuously, in which silicon dioxide nano particle acts as high molecules solid plasticizing agent and is 10-30% of total weight of PEO and P(VDF-HFP) high molecules;    (E) obtaining high molecules/nano particle mixing liquid after stirring evenly and continuously;    (F) adding iodine (I2)/lithium iodide (LiI) oxidation reduction electrode pair into the modified macromolecular compound solution;    (G) stirring for 24-48 hours in normal temperature to obtain long chain alkyl silane coupling agent modified polymer electrolyte system;    (H) adding long chain alkyl silane coupling agent modified polymer electrolyte system on the membrane surface of dyestuff sensitization nanocrystalline;    (I) roasting in the baking oven at 80 degrees C for 3-5 hours;    (J) adding platinum-planted conductive glass pair electrodes; and    (K) continuously baking until the electrodes are tightly connected and assembled into the dyestuff sensitization nanocrystalline solar battery.