As a social phenomenon, the development and change of language reflect the dynamic development of society. As a special language, network buzzwords vividly reflect the development and change trend of the current society and provide a special cognitive way for people to understand the society and the world. With the development of globalization, the publicity of national image has increasingly become the focus of people’s attention, and scholars in the field of linguistics have conducted research on the construction of national image from different perspectives. Therefore, in order to explore the relationship between the variation of network buzzwords and the construction of national image, this paper studies the buzzwords in recent five years based on sociolinguistics theory. The study shows that: 1) The variation of network buzzwords mainly includes semantic variation, part of speech variation, lexical variation and phonetic variation; 2) The variation of network buzzwords is mainly influenced by social, cultural, register and personal factors; 3) The variation of network buzzwords is closely related to the construction of national image, which should not be underestimated.