High bilirubin blood symptom is a common illness for the newborn, which may lead to Jaundice Detector. Therefore, in clinical medicine, the newborn jaundice needs a dynamic observation so that the illness will be found and treated in time. The transcutaneous jaundice detector is controlled by optical, electronical and information processing technologies. It is small in volume and easy to handle. If the detector head is put on the newborn forehead, the percutaneous value correlative with serum bilirubin concentration is instantly and accurately determined.