The invention provides a method for preparing an aluminium electrolysis carbon anode, and relates to a method for manufacturing the aluminium electrolysis carbon anode by taking flotation de-ashing coal and coke powder as raw materials. The method is characterized in that the flotation de-ashing coal and the crude petroleum coke powder are adopted as raw materials to prepare the aluminium electrolysis carbon anode, and the preparation process comprises: mixing the flotation de-ashing coal and the crude petroleum coke powder to be pressed into agglomeration, drying and calcining to obtain composite calcined coke, and using the obtained composite calcined coke to partly or completely replace the petroleum coke for manufacturing the aluminium carbon anode. The method solves the technical problems brought to the production of the carbon anode since the petroleum coke is pulverized increasingly, expands the selection range of the aluminium carbon anode resource, provides a way for leading the coal resource of China to be transformed into raw material from fuel, and improves the added value of the coal resource.