Children’s recurrent fever is considered to be related to infections or blood system diseases, autoimmune diseases, etc., and children’s body resistance is relatively weak may also have a certain relationship. A common cause of recurrent fever in children is infection, when bacterial, viral or mycoplasma infections, causing bronchitis pneumonia, acute gastroenteritis, urinary tract infections, etc., the child is prone to recurrent fever. In addition, children with recurrent fever also need to be alert to the presence of leukemia and other blood system diseases, it is recommended that timely medical treatment, if necessary, bone marrow aspiration to confirm the diagnosis. Autoimmune diseases such as systemic lupus erythematosus, rheumatoid arthritis and rheumatic fever may also cause recurrent fever. Children with recurrent fever may also have other reasons, such as children’s body resistance is relatively weak, etc. It is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.