The invention relates to a leg health-care orthopedic instrument for children. An orthopedic plate matched with the height of a child is vertically fixed on a horizontal bottom plate; an ankle distance limit plate is vertically fixed in the middle of the joint of the bottom plate and the orthopedic plate; a spacer is fixed on the height position of a poples of the vertical orthopedic plate; an orthopedic belt is arranged on the knee position; and a fixed belt is arranged on the altitude position of the ankle. The invention has the functions of prevention and orthodotics without wound pain, is convenient to use and has obvious curative effect, is welcomed by parents in the clinical trial process, is mainly used for protecting the health and straightening O-shaped or X-shaped legs for children, has multiple functions, is simple and easy to use at any time, is particularly convenient for parents who are in work and have no time to take the children to the hospital and can be used as a walker for babies, thereby being beneficial to promote and implement.