Abstract: An illuminating decoration for skateboard includes two illuminating tubes attached to two lateral sides of a skateboard, and electrically connected to a control box provided at an underside of the skateboard, so that the two illuminating tubes are turned on or off through control of the control box. Each of the two illuminating tubes includes a transparent tube and a plurality of light-emitting elements disposed in the transparent tube. The illuminating tubes are sealed at front and rear ends thereof, such that the light-emitting elements are enclosed in the transparent tubes to emit light and produce even brightness without the risk of being invaded by dust and moisture. The transparent tube is flexible and therefore impact resistant.