In the all-media era, new changes have taken place in the dissemination, guidance and influence of public opinion on society. With the wide application of Internet technology and smartphones, the scale of Internet users is also expanding. According to the latest statistics of CNNIC’s 49th report, as of December 2021, the number of Internet users in China has reached 1.032 billion, the network penetration rate has reached 73.0%, and the scale of mobile Internet users has reached 1.029 billion, which means that mobile Internet users account for the vast majority of the total Internet users. At the same time, various mobile apps, such as Weibo and WeChat, are increasingly becoming important ways for people to obtain information and express their views. With the development of social media, the information environment dominated by traditional media has changed, and the environment guided by public opinion is more complex, especially in the “post-truth society”, where emotions have a great influence on the audience’s attitude. Social media has had various impacts on the environment of public opinion, and the rapid development of social media will inevitably have a certain impact on the ecology of public opinion. In view of the rise of social media, the media and the public put forward some thoughts, that is, how to promote the healthy development of public opinion ecology. Public opinion needs the participation of the public, opinion leaders, media and government. Constructing a sound network public opinion guidance system is of great significance to promote the harmonious and stable development of our society from the aspects of creative consciousness, content production and communication quality.