A polyurethane decorative lighting product comprising a casing made of polyurethane material and a lighting source positioned in the casing. By using polyurethane material, this invention greatly simplifies the manufacturing process and increases the production efficiency. In addition, since the material is elastic in nature, the semi-finished products and finished products are not easily broken or cracked from an impact or fall which may occur during transportation. The elastic nature of the material also makes it unnecessary to use special packing materials to meet safety and protection requirements.