Method for manufacturing electrolytic copper foil capable of maintaining high tensile strength after heat treatment

The invention provides an electrolytic copper foil manufacturing method capable of keeping high tensile strength after heat treatment, and belongs to the technical field of electrolytic copper foils. Comprising the following steps: (1) preparing a copper sulfate electrolyte from sulfuric acid, copper and high-purity water in an electrolytic bath; (2) an electrolytic copper foil additive is added into the electrolyte; and a step (2) of manufacturing an electrolytic copper foil by applying a current between the anode plate and the rotating cathode roller, which are spaced apart from each other, in the electrolytic cell to form and grow nuclei on the cathode roller. The electrolytic copper foil additive comprises the following raw material components in percentage by weight: 12 to 26 mg/L of an organic sulfide additive A, 8 to 22 mg/L of an organic nitride additive B, 7 to 18 mg/L of a nonionic water-soluble polymer additive C and 8 to 15 mg/L of a thiourea organic additive D. The electrolytic copper foil manufa