The invention relates to a method for adding bubbles in an EDC water tank to produce a lead-bath-free wire. The method comprises the steps that firstly, water cooling and spinning are conducted aftersteel blank rolling; secondly, a wire ring is subjected to temperature reset and then enters an EDC system to be subjected to phase change treatment; thirdly, a bubble generator is arranged in the EDCwater tank, hot water in the EDC water tank is in a steam-water mixing state, a steam film is broken through the bubbles at the cooling earlier stage, the earlier stage cooling speed is increased, the bubbles are used for isolating the wire from the hot water part in the cooling later period, and the cooling speed is reduced; and fourthly, the wire cooled through the EDC water tank can be directly drawn into a steel wire without lead bath. According to the method, the lead bath cooling effect can be reached or approached, and the wire drawability and steel wire performance are improved by improving the cooling condition and the wire structure performance; and the method can be adopted for replacing the lead bath, energy can be better saved, and the steel wire production cost is reduced.