With the emergence of the Internet, online public opinion has gradually emerged. As a positive force, online public opinion has made unprecedented contributions to society, such as the supervision of online public opinion, and people have great expectations for online public opinion. However, after some hot events are hotly discussed by netizens, online public opinion often deviates from the normal track and appears in an extreme and violent form, that is, cyber violence. Cyber violence is different from violence in real life, it is a combination of fists and fists, but it hurts and slanders people with words by means of the virtual space of the network. In the online world, everyone can be the source of information, and the openness and grassroots nature of the online world give people the conditions to speak freely. However, while enjoying freedom of speech, people often forget the publicity of individuals in this open society. The lack of people's right to speak in real life makes the network an outlet for people to vent their emotions to some extent. A moment's catharsis may bring a moment's pleasure, but it comes with a price to pay for touching the moral bottom line. Cyber violence has evolved from the initial verbal warfare of netizens to personal attacks, to human flesh search and death threats, and every step has gone to the swamp of anger. There are many reasons for cyber violence. The emergence of cyber mobs in China is closely related to the younger netizens in China. According to relevant reports, more than two thirds of netizens in China are young people under the age of 30. These young netizens are passionate, energetic and keen to express their views, but they are also impulsive and easily angered. As soon as some events are posted online, they can't wait to express their views and positions with keyboards, showing their dissatisfaction and anger. It is very easy for these angry individuals to form a temporary group with the same views on the Internet, and then carry out planned, purposeful and organized recovery and attack on the parties as a group in the name of "justice".