With the continuous development of technology, in recent years, short video shows a rapid development trend, both its user scale and the number of applications has been rapidly improved. Tik Tok, as one of the larger short video platforms in China, has become an entertainment tool for people by virtue of its comprehensive audio-visual presentation. Tik Tok short video, because of its diversified communication elements, can quickly capture hot events and arouse widespread concern, stimulate the social synergy of public opinion and promote the construction of a good social order; At the same time, it will help to improve the style of departments and institutions, make up for the lack of legal system, enhance communication and understanding from all walks of life, and finally realize the positive value of public opinion mobilization. Based on the development status and characteristics of Tik Tok short video, this paper focuses on the core issues of positive energy transmission and public opinion guidance of Tik Tok APP, explores the public opinion guidance mechanism of Tik Tok short video explaining hot events, and discusses the possible problems in the process of public opinion generation. In order to contribute to the related research.