Separation anxiety disorder in young children, also known as separation anxiety disorder in children, is a type of anxiety disorder that refers to severe anxiety reactions in young children and children caused by fear of separation from their loved ones. It is normal for children who are just toddlers and preschoolers to show some degree of anxiety significantly when they are actually or potentially separated from the people they depend on. Only when this fear of separation exceeds the usual level of anxiety for their age or is accompanied by significant impairment of social functioning is a diagnosis of separation anxiety disorder in young children made. The prevailing view of the causes of separation anxiety in young children is that separation anxiety arises in response to a combination of the loss of a dependent object. The corrective measure is that it is perfectly normal for children to experience anxiety when there is a change in their environment. However, once the anxiety is too prolonged, it will have a great impact on the child’s body and mind, and some interventions should be taken at the right time to avoid adverse effects on the child’s psychological growth and development.