The UK is one of the first countries in the world to protect children in need by legislation. Since the 21st century, UK has promulgated a series of social assistance laws for children in need, and its social assistance measures are mainly reflected in improving the living standards of families, helping to improve the unemployment situation, striving to achieve education equity, and providing subsidies to relieve pressure. UK has established a sound social assistance system for children, formed the co-operation between social assistance and social insurance benefits, and created a democratic decision-making mechanism and effective cross-sectoral cooperation. In UK's social assistance for children in need, a "government-enterprise-institution" multiple-party children social welfare governance system plays an active role. Education welfare is the best way to solve the problem of the transmission of child poverty from generation to generation. The value objective of social assistance for children is the pursuit of social equity and the balance of market efficiency. The legal regulation of children's social assistance in Britain provides a reference for China to establish and improve the social assistance system with Chinese characteristics for children in need.