Linguistic landscapes in public spaces offer an important perspective for examining sociolinguistic structures, language policy implementation, and local cultural expression. Taking the public signage of Qionghai National Wetland Park as the research object, this study establishes a corpus of 424 samples through fieldwork and conducts a systematic analysis of multilingual practices in urban public spaces of ethnic minority regions. The findings reveal that the linguistic landscape of the park exhibits a hierarchical structure in which the national common language occupies a central position, ethnic languages maintain a symbolic presence, and foreign languages are used for service functions. Multilingual signage not only represents the concrete implementation of national language policy in grassroots public spaces, but also is the result of the combined effects of local cultural expression and tourism service demands in public space. The study demonstrates that the linguistic landscape of urban public spaces in ethnic minority regions constitutes a structural pattern jointly shaped by national language policy, ethnic cultural expression, and the realistic demands of tourism development, thereby providing new empirical materials for understanding language order and cultural expression in the public spaces of ethnic minority regions.