The invention relates to an electrolyte preparation method of three-dimensional nanometer silicon liquid storage batteries. The electrolyte consists of double ingredients: an ingredient A and an ingredient B, and contains silicon, sulphuric acid, phosphoric acid, lithium, potassium, aluminum, polyethylene glycol and purified water. The invention can realize the effects of high power, small internal resistance, long service life, at least five years of the colloid stability period, little self discharge and two years of storage period after sufficient charging of a colloid storage battery. The power maintains 90 percent, the self charging recovery reaches 90 percent, the invention is applicable to military combat readiness and automobile manufacture and storage, and the environment protection and energy saving effect reaches 30 percent. The maintenance is avoided, and the use is safe and reliable.