The invention discloses a method for recycling copper from copper nitrate waste water. The technical key points of the invention are that: an iron rod is taken as an insoluble anode; a copper plate is taken as a cathode; and gas stirring is performed on the copper nitrate waste water in an electrolytic bath, so that an electrolytic process can be operated continuously. The purity of the copper recycled by the method is over 99.97 percent, and the recovery rate of the copper is over 99.5 percent. The method has the advantages of short process flow, simple operation, simple equipment, low equipment requirement, low investment and particular suitability for the realization of the recycling of the copper from the copper nitrate waste water in small and medium-sized enterprises.