The invention discloses a method for preparing a high-purity 
copper oxide powder material, belonging to the field of high-performance functional materials. The 
raw material for preparing the high-purity 
copper oxide powdery material is red 
copper wires or red copper rods. The preparation method comprises the steps of 
cutting recovered waste red copper wires or red copper rods into small pieces, heating the small pieces in a 
rotary furnace embedded with a pure copper lining plate or high-temperature-resisting stainless copper lining plate, putting red copper balls into the 
rotary furnace to serve as 
grinding balls at the same time, starting to inflate 
oxygen into the 
rotary furnace when the rotary furnace is heated to a certain temperature to ensure that copper is in full contact with the 
oxygen under a high-temperature condition to generate an oxidation reaction, and fully crushing 
copper oxide generated through the reaction under the action of the 
grinding balls at the same time, thereby obtaining the high-purity 
copper oxide powder material. The method disclosed by the invention is simple in production process and low in production cost, and the oxidation of copper and the crushing of 
copper oxide are performed at the same time, so that the process flow is effectively shortened. Impurities are not introduced during 
processing and preparation, so that the obtained copper 
oxide powder material is high in purity which can reach more than 99%.