Cerebral palsy is the most common cause of walking dysfunction in children. Lower limb exoskeleton has been maturely used in the rehabilitation of adult spinal cord injury or stroke patients. However, there are relatively few studies on the improvement of gait and walking efficiency in children with cerebral palsy. To promote researchers′ understanding of the lower limb exoskeleton for children with cerebral palsy from the technical and clinical perspective, this article firstly analyzes the special problems faced by the research of exoskeleton for children with cerebral palsy. Secondly, according to the number of lower limb driving joints, this article classifies the lower limb exoskeleton of children with cerebral palsy and reviews its research status, focusing on its mechanical characteristics, control strategies and clinical manifestations. The advantages and disadvantages of children exoskeletons for cerebral palsy with single and multi-joints were analyzed. Finally, the development trend and challenges of lower limb exoskeleton for children with cerebral palsy are discussed.