Medical blue light lamp using a special wavelength of blue light, so that bilirubin into a non-toxic isomers discharged from the body, to promote its metabolism and make the jaundice index decline. Bilirubin can absorb light, and under the action of light and oxygen, the bile-soluble bilirubin oxidizes to become a water-soluble product that can be discharged from the urine, thus reducing the serum concentration of non-conjugated bilirubin, and achieving the purpose of treating jaundice in newborns.