Abstract: A production method of double-wire string lights, comprising the steps of: prepaying wires; annealing to optimize the flexibility of the wires; cooling and washing; making outer layer of the wires; removing the outer layers of both the positive and negative wires to expose the positive and negative wires and form the bulb welding positions; coating with tin; using an automatic bulb welding machine for welding of the positive wire bulb welding positions and the negative wire bulb welding positions corresponding to the positive poles and negative poles of the surface-mounted LED chips; wrapping the surface-mounted LED chips and the bulb welding positions with high-transmission epoxy resin and then putting them into a UV pre-solidification equipment with an extraman to solidify the epoxy resin in exposure to UV, demolding after solidification; the simple structure offers convenience and flexibility in use.