The present invention discloses a color changing light and related light chain thereof. The color changing light comprises: connecting line group; a lampholder disposed on the connecting line group; a lighting module connected to the connecting line group; a bulb installed on the lampholder; the connecting line group comprises live wire, neutral wire and signal wire, the neutral wire extends to one end of the lampholder and connects to the lampholder, the live wire and the signal line respectively connect to two springs on the bottom of the lampholder; the lighting module is disposed separately with respect to the lampholder, the lighting module comprises a base matching the screw of the lampholder, a lighting object disposed inside the base, wherein the neutral wire of the lighting object is disposed on the base, the live wire and the signal wire extend outward with respect to the bottom of the base.