Abstract: A structure for LED Christmas light is provided, including a light holder, being a hollow body having a separating part connected to the inner wall of the light holder to divide the hollow interior of the light holder into two cavities. Each of the two opposite sides of the inner wall of the light holder connected to the separating part forms a slot and face the surface of the separating part of the two cavities, with each having a guiding channel. Two wire sets are fixed inside the two cavities. An LED light bulb has a positive pin and a negative pin inserted inside the guiding channel, respectively, and being electrically connected to the wire sets. A light cap has a holding part passing the LED light bulb to tightly engage to the top of the light holder so as to fix the LED light bulb to the light holder.