In order to understand the research status and hot research directions in the field of health risk communication under public health events, 290 selected studies were visually analyzed by CiteSpace. This study found that health risk communication under public health events had attracted much attention and the focus on it continued to rise in recent years. After further analyzing the selected studies, the relationship diagram of health risk communication subjects under public health events was drawn. Through literature review, we found that at current stage, health risk communication had changed from the one?way public health education mode to the multi?agent interactive communication mode. Trust and interaction were the key factors affecting the communication process. The hot research direction should be how the public, the media and other subjects participate in health risk communication and how to play a role in the mutual communication process. The measurement of the relationship between the subjects and the weight in the communication process are still issues to be studied.