The invention provides a method for preparing a lead electrolyte by utilizing industrial waste liquids and relates to the field of chemical technology. The method comprises the following operating steps. First, waste liquids generated from industrial production of high calcium fertilizer, phosphate fertilizer, anhydrous hydrofluoric acid and the like are employed as raw materials. Second, after the raw materials being sent into a factory, contents of various components of the raw materials are first tested, and water is added to dilute the raw materials according to the contents of hydrofluoric acid and silicofluoric acid in the raw materials. Third, according to the content of hydrofluoric acid in the raw materials, silicon powder is added, and stirred at a rotating speed of 50-100 r/min for about 24 hours. Fourth, according to the contents of harmful elements such as sulfur, phosphorus and the like, yellow lead powder is added and stirred for about 48 hours to remove sulfate and phosphate. Fifth, if hydrofluoric acid, sulfate, phosphate and the like which are not reacted completely are left in the solution, according to the contents, appropriate amounts of quicklime and plant ash are added to neutralize hydrofluoric acid, sulfate, phosphate and the like to remove hydrofluoric acid, sulfate, phosphate and the like completely, and a qualified lead electrolyte mother liquid is prepared finally. The method solves the problems of high production cost, high energy consumption, environmental pollution and the like in the prior art.