The invention discloses a method for producing aluminum electrolyte by using aluminum electrolysis waste materials and recycling carbon. The method comprises the following steps: pretreating, floating and separating, preparing and post-treating. The method specifically comprises the following steps: crushing the aluminum electrolysis waste materials and magnetically selecting to remove scrap iron; separating the pre-treated aluminum electrolysis waste materials to obtain a bottom flow product and a foam product; carrying out filtering, carbon removing and crushing on the bottom flow product obtained by separating to obtain target electrolyte for the aluminum; carrying out filter pressing and drying on the foam product obtained by separating to obtain target carbon powder; and recycling smoke and wastewater generated in the preparation process and discharging after the standards are reached. The method takes wastes which need to be urgently treated as raw materials; all resources are recycled and utilized and waste gas is collected and purified; the produced aluminum electrolyte is low in water content and less in harmful impurities, and is an ideal raw material for aluminum electrolysis production; the floated carbon powder can be used as aluminum electrolysis cell bottom paste or can also be used as a dye for bottom carbon block production or metallurgy production.