In children, dry mouth after vomiting is considered to be related to dehydration and electrolyte disorders. Vomiting in children is relatively common in the clinic, mainly including physiological vomiting, central vomiting, reflexive vomiting, vestibular vomiting and so on. Vomiting leads to loss of fluid in the body, which is prone to dehydration and electrolyte disorders. If no attention is paid to hydration, it can lead to dry mouth after vomiting. If your child is dehydrated, it is recommended that he or she be rehydrated in a timely manner, if necessary through intravenous rehydration, to replenish the body’s need for water and to avoid further aggravation of the dehydration. If the symptoms of vomiting persist, it is also necessary to go to the hospital for examination to clarify the cause and treat the primary disease.