Preparing method for copper oxide powder

The invention provides a preparing method for copper oxide powder. The preparing method comprises the following steps that 1, copper powder, hydrogen peroxide and sulfuric acid react to generate a mixed water solution; 2, under existence of a polyethylene glycol template addition agent, sodium bicarbonate, sodium carbonate and the mixed water solution react to generate basic cupric carbonate; 3, the basic cupric carbonate is decomposed at high temperature to generate copper oxide powder; 4, the copper oxide powder is placed into volatile solvent to be treated ultrasonically, the solvent is volatilized after ultrasonic treatment, and the copper oxide powder with the morphology changed is obtained finally. The method comprises two morphology control processes of the copper oxide powder, the first process is the copper oxide growth morphology control process, and the second process is the copper oxide agglomeration morphology control process. The preparing method is simple and convenient, the problem that the morphology is difficult to change after copper oxide is synthesized is solved, and multi-way application of the copper oxide of different morphologies can be expanded easily.