The invention discloses a production method of a galvanized steel wire. A solvent method is mainly adopted for steel wire hot galvanization at present, and because an acid washing process is adopted, equipment and a factory can be corroded, the health of workers in the environment for a long time is damaged, and the energy consumption of the method is also higher. In order to overcome the defects, the invention provides the production method of the galvanized steel wire, which sequentially comprises the processes of wire unwinding, mechanical stress elimination, ultrasonic compound washing, water washing, plating assistance, hot-dip plating and wire winding. In the method, a plurality of steel wires are synchronously and continuously galvanized on line at the same speed, the traction force of the whole equipment is provided by wire winding equipment without other powers, and a roller is used in the wire arranging process of the steel wires. The production method is simple, a pluralityof galvanized steel wires can be synchronously and continuously produced at the same speed, and the production method has high efficiency, low energy consumption, time saving, labor saving and short period, avoids the possibility that the steel wire is rusted again, and has no acid washing, less environment pollution, low cost and good quality of the galvanized steel wire.