This is a high-speed train parent-child seat, which is improved according to the existing child safety seat and combined with adult seat to form a whole. Children can enjoy comfortable safety seat without occupying a single position, thus reducing the burden of parents carrying infants and young children on the train. The seat can be turned and fixed on the wall to ensure the safety and comfort of children to the greatest extent. In addition, the safety seat can be stored inside the base of the adult seat, and the seat can be sold to ordinary passengers, maximizing space and cost savings.