Light guide element and illumination decoration device thereof

The invention discloses a light guide element and an illumination decoration device thereof. The surface of the light guide element comprises a light-in surface, a light-out surface and an arc-shaped reflecting surface; the light-in surface and the light-out surface are respectively adjacent to two ends of the arc-shaped reflecting surface; the light guide element is further provided with a light insulation reflection structure; the light insulation reflection structure can prevent light entering the light-in surface from directly entering the light-out surface and can reflect light entering the light insulation reflection structure from the interior of the light guide element; and light entering the light-in surface can reach the light-out surface after being reflected by the arc-shaped reflecting surface for at least one time. According to the illumination decoration device provided by the invention, the brightness and the color uniformity of all positions of the light-out surface in the length direction ca