Its high purity electrolytic copper electrolytic purification method

The present invention provides a high purity electrolytic copper, and an electrolytic purification process. The electrolytic purification method has a high purity electrolytic copper step of: using the electrolytic solution containing copper nitrate solution, a cathode electrode made of stainless steel, and the electrolytic anode electrode made of copper, whereby the high-purity electrolytic deposition on the cathode electrode a mixture of copper, wherein, (a) the electrolytic solution containing 20ppm or more of polyethylene glycol, and polyvinyl alcohol as an additive, (b) the molecular weight of the polyethylene glycol to Z, the current density during electrolysis when set to X (a / dm2), the following relation to satisfy conditions of electrolysis: 1000≤Z≤2000,1.2- (Z-1000) × 0.0008≤X≤2.2- (Z-1000) × 0.001.