Abstract: Firstly, the definition and basic features of swarm robotics are introduced, and the advantages over traditional multi-robot control methods are summarized. Then, the main design and analysis methods of swarm robotics are concluded. The research of swarm robotics are categorized as four aspects: spatial organization, collective navigation, collective decision-making and other collective behaviors. The progress and frontiers of each category in recent ten years are reviewed. Finally, the current challenges and key scientific issues in swarm robotics are clarified and analyzed, and the outlook of development trends in swarm robotics is given.