As one of the largest cities in the world, London faces multiple flood pressures. With the development of the times, the concept of flood control in London has gradually shifted from the traditional flood control-oriented defense to the comprehensive flood risk management focused on flood prevention and recovery, which has achieved satisfactory effects. This study started from the types and characteristics of floods in London and then the current flood risk management organization system in the UK was acquainted. Risk management measures in London were analyzed and summarized from five aspects, including preventive measures, resilience measures, mitigation measures, preparatory measures and recovery measures. Among them, the city planning, the Thames estuary flood control project system which is capable of resisting the millennium storm surge, the underground drainage system with ecological drainage measures, the accurate flood warning and forecasting system, and the perfect flood insurance and rescue systems can provide reference for urban flood management in China.