The invention relates to a method for purifying copper slag to extract metal copper through zinc hydrometallurgy and belongs to the technical field of comprehensive utilization of metallurgy resources. The method comprises the following steps: firstly, performing deep dehydration drying on purified copper slag, performing fine milling, putting into a sulfuric acid solution, further adding hydrogen peroxide for acid oxidation leaching, filtering after leaching is completed, recycling lead silver from filter residues, namely lead silver slag, putting activated copper powder into filtrate, removing hydrogen peroxide residues in the solution, precipitating a part of Cl by using a CuCl precipitating method, and filtering so as to obtain a copper-enriched liquid; performing turbulent flow electrodeposition on the copper-enriched liquid, collecting metal copper from a cathode after electrodeposition is completed, and collecting a residual solution after electrodeposition, namely a copper-poor liquid with Zn and Cd; feeding back a part of the copper-poor liquid into an acid oxidation leaching procedure as a leaching agent, and diluting copper of another part of the copper-poor liquid through turbulent flow electrodeposition so as to obtain a tail liquid with Cd and Zn of high concentrations, and recycling Cd and Zn through a zinc smelting cadmium recycling procedure. The invention provides the method for extracting the metal copper by using a process of complete wet-method sulfuric acid/hydrogen peroxide oxidation acid leaching-activated copper powder blending-turbulent flow electrodeposition.