The alpine periglacial wetland, situated near the alpine snow belt, represents one of the most extreme wetland ecosystems. The National Wetland Park in the Jimunai alpine periglacial zone, Xinjiang, China, is located within the the Mus Island glacier region and harbours rich plant diversity shaped by its unique geography and environment. In this study, we present an updated checklist of vascular plant of the Park based on a comprehensive literature review, including specimen analysis, database retrieval and field surveys. The revised checklist includes 372 species, 179 genera and 46 families, reflecting a significant increase of 158 species, 45 genera and two families compared to previous records. Notably, the updated list identifies 20 rare and endangered species, four endemic plants of Xinjiang and 23 species newly recorded for the local area. These findings enhance the floristic knowledge of the Jimunai alpine periglacial zone and highlight previously overlooked plant diversity in this extreme habitat. This updated inventory will serve as an essential foundation for further biodiversity research and will be instrumental in guiding effective conservation efforts for this distinct alpine periglacial wetland. The revised checklist includes 372 species, 179 genera and 46 families, reflecting a significant increase of 158 species, 45 genera and two families compared to previous records. Notably, the updated list identifies 20 rare and endangered species, five endemic plants of Xinjiang and 23 species newly recorded for the local area. These findings enhance the floristic knowledge of the Jimunai alpine periglacial zone and highlight previously overlooked plant diversity in this extreme habitat.