The invention discloses a method for producing metal aluminium by high-alumina fly ash chlorination electrolysis, which comprises the following process steps: firstly, magnetic separation of fly ash to remove iron; secondly, fluidizing chlorination, that is, mixing high-alumina fly ash and oil coke powder, adding the mixture into a fluidizing chlorination furnace, introducing chlorine into the furnace to allow the alumina in the fly ash to react completely so as to obtain aluminium chloride double molecular flue gas; thirdly, processing and purification of the aluminium chloride flue gas, that is, purifying the aluminium chloride flue gas by a filter, cooling the purified aluminium chloride flue gas in a condenser to condense other chloride impurities, discharging the impurities out of the flow in a form of ash, continuing cooling the flue gas in a trap to obtain raw anhydrous aluminum chloride crystals, performing impurity removal and sublimation purification of the raw anhydrous aluminum chloride crystals by an aluminium chloride sublimation purification furnace; fourthly, molten salt electrolysis, that is, adding the anhydrous aluminum chloride into an aluminium chloride electrolytic tank, performing electrolysis to obtain aluminium liquid, casting the obtained aluminium liquid to prepare aluminum ingots. The process of the invention is used for processing high-alumina fly ash to obtain aluminum ingots, and fly ash is utilized reasonably.