An electrodeless side-mounted LED string light, a method and an apparatus for manufacturing the same are provided by the disclosure. The electrodeless side-mounted LED string light includes: a first wire and a second wire, a plurality of LED units and a plurality of encapsulants. Each LED unit includes a first surface-mounted LED and a second surface-mounted LED. Luminous surfaces of the first and second surface-mounted LEDs are opposite to each other. The luminous surfaces of the first and second surface-mounted LEDs are perpendicular to an axial direction of the first and second wires. The plurality of encapsulants respectively encapsulants the first and second surface-mounted LEDs therein. With the electrodeless side-mounted LED string light of the disclosure, the utilization rate of the lighting wire of the string light is improved, the utilization rates of raw materials and apparatus are improved, the product quality and manufacturing efficiency are improved.