Internet violence is a problem that people all over the world must face. At present, a number of young people have committed suicide because of the severe network violence. This phenomenon has a great impact on the physical and mental health of young people, but also to the construction of a harmonious society will produce obstacles. This article will analyze the bad phenomena and behaviors caused by teenagers’ herd mentality from the example of online violent suicide, and analyze the root causes of these phenomena and behaviors. For this reason, young people must be correctly guided to form a good outlook on the world, life, and values, and use the Internet in a civilized manner to prevent and intervene in such similar tragedies from happening again.