The invention relates to a method for preparing a continuous extrusion high-tech energy-saving copper bus. In materials, the content of copper and sliver is more than or equal to 99.94, and the content of oxygen is less than or equal to 0.0015. The preparation method comprises the following steps: firstly, melting, namely, placing No. 1 electrolytic copper or cathode copper into a melting furnace, raising the temperature of the furnace, keeping the temperature of copper liquid between 1,130 and 1,170 DEG C, and covering a charcoal layer on the surface of the copper liquid; secondly, updraft continuous casting, namely, directly extending a hollow crystallizer into the copper liquid, cooling the hollow crystallizer by adopting a water jacket, condensing the copper liquid into solid in the hollow crystallizer, and drafting the upper end of the solid by a drafting mechanism to manufacture a copper rod; thirdly, continuous extrusion, namely, placing the copper rod obtained in step two into an extruder, and continuously extruding the copper rod into a blank; and fourthly, cold drawing and forming, namely, placing the blank obtained in step three into a drawing machine to carry out cold drawing and forming to prepare the continuous extrusion copper bus. The content of the oxygen of the continuous extrusion copper bus is low.