The reason why children vomit and keep asking for water is that children vomit so that the body loses a lot of water and digestive fluids, which leads to dehydration and manifests itself in the form of drinking water all the time. Under normal circumstances, the body’s metabolism in the fluid environment, the fluid environment in the extracellular fluid stabilization is the body to maintain normal activities. When a child vomits due to various reasons, the body loses a large amount of water, digestive juices rich in ions, which leads to a decrease in extracellular fluid, causing dehydration, causing the child to drink water all the time to replenish the lost water. Children vomiting has been asked to drink water may also have other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.