Under the background of cultural and tourism integration and consumption upgrading of Generation Z, music festival has become an important carrier of urban image communication. This paper takes Strawberry Music Festival as an example, based on the actor network theory (ANT), uses the rooted theory to carry out three-level coding on the interview data of 10 senior participants, and builds a dynamic network model by combining the translation mechanism of “problematization - benefit conferring - recruitment - mobilization”. The research findings are as follows: Music festival, as a cultural translation center, transforms urban cultural capital into a perceptible experience scene for young people through local symbol production such as intangible cultural heritage workshop and dialect interaction; Participants use UGC content creation and ritualized behavior to reconstruct urban cognition and drive the spread of social media; Through the optimization of infrastructure, the city interacts with the music festival to realize the dynamic update of the city image. At the theoretical level, the synergistic logic of human and non-human actors is revealed, and the application boundary of ANT in cultural events is expanded. In practice, strategies such as strengthening the accuracy of local symbol translation and optimizing the service response network are proposed to activate the long-term communication mechanism of urban image.