The utility model relates to a Christmas tree light. The Christmas tree light mainly comprises a base body, a water light and an accessory unit, wherein a light emitting assembly and a rotary mechanism are arranged in the base body; the water light is modeled into a light permeable circular cone, and is correspondingly and fixedly arranged on the base body; the accessory unit surrounds the water light in a spiral manner, is assembled on the rotary mechanism and rotates with the rotary mechanism; therefore, when the accessory unit is driven by the rotary mechanism in the base body to rotate, the dynamic effect is generated, and at the same, light sources of the light emitting assembly project light onto the water light, so that the gorgeous visual effect is improved.