The research on key management technology of sensor network under internet of things environment is a basic work, which has vital significance for research on sensor network security. This paper reviews on the research results by the current domestic and foreign scholars, in order to bring the inspiration for the future related research work. First, it elaborates the research content and challenges of the key management technology of sensor network under internet of things environment; secondly, summarizes the research achievements of the technology at home and abroad, and discusses the existing problems and shortcomings of existing achievements; finally, points out the research focus in the next step.