Chewing on pencil lead is not a cause of lead poisoning in children. The main component of pencil lead is graphite, which is carbon and does not contain lead, so chewing on pencil lead will not lead to lead poisoning, which may be caused by the coating on the exterior of pencils, or toys, tables and chairs, which contain paints with lead components, coupled with the lack of children’s cognitive understanding of the matter, which is easy to be sent to their mouths, resulting in lead poisoning. When lead poisoning is suspected, blood and urine toxicity tests should be conducted in a timely manner to clarify whether there is lead poisoning and then carry out relevant treatment. Daily attention should be paid to prevention, hand washing, pay attention to personal hygiene, to avoid children toys or other objects into the mouth, causing lead poisoning.