NOVELTY - Preparing three-dimensional nano-silicon liquid storage battery electrolyte comprises: (a) preparing A component; (b) preparing B component; and (c) preparing three-dimensional nano-silicon liquid storage battery electrolyte.    USE - The method is useful for preparing three-dimensional nano-silicon liquid storage battery electrolyte (claimed).    ADVANTAGE - The method is applicable to energy storage for military equipment and automobile manufacturing, and it saves energy by 30%; besides, the method is free from maintenance, and is safe and reliable to use.    DETAILED DESCRIPTION - Preparing three-dimensional nano-silicon liquid storage battery electrolyte comprises: (a) preparing A component: preparing 15-22% of purified water, 75-82% of sulfuric acid and 3-5% of phosphoric acid, by weight; mixing and uniformly stirring various components to obtain A component; freezing the A component to minus 18 degrees C, and storing, wherein the insulating resistance of the purified water is not less than 2 megaohms, and volume rate concentration of the sulfuric acid and the phosphoric acid is 98%; (b) preparing B component: (i) preparing three-dimensional nano-silicon liquid: preparing 3-10% of silicon dioxide, 0.001-0.0001% of sodium oxide, 0.000001% of iron trioxide, 0.000001% of chlorine dioxide, 0.000001% of lead dioxide and water for the rest by weight, wherein granularity of the silicon dioxide particle is 1-10 microns, and pH value of the solution is at 10-13; and (ii) preparing B component: in terms of weight of the three-dimensional nano-silicon solution, adding 4% of glycerol, 0.5% of lithium hydroxide, 0.5% of potassium hydroxide, 0.000001% of aluminum hydroxide and 0.001% of polyethylene glycol in the three-dimensional nano-silicon solution; uniformly stirring to obtain B component; decreasing temperature and storing the B component at 2 degrees C; and (c) preparing three-dimensional nano-silicon liquid storage battery electrolyte: mixing the A component and B component in the ratio of 1: 0.18-0.25 by weight to obtain electrolyte.