The cause of vomiting and diarrhea in children is mainly due to acute gastroenteritis, which can be caused by improper diet or eating unclean food, and will result in vomiting and diarrhea. Vomiting and diarrhea can also occur when children are infected with rotavirus or norovirus, which can cause acute gastroenteritis symptoms, including vomiting and diarrhea. To relieve vomiting and diarrhea in children, the following measures can be taken: first, replenish water and electrolytes in a timely manner. Because children in vomiting and diarrhea will have water and electrolyte loss, do not pay attention to electrolyte and water replenishment, will cause dehydration and the usual electrolyte disorders, seriously affecting the health of children. Secondly, children can be given timely anti-infection treatment. If children’s acute gastroenteritis is caused by severe bacterial infection, timely application of ceftriaxone and other cephalosporin treatment.