Biodiversity is increasingly threatened by localized extinctions under the impacts of global climate change, and alien species may exacerbate these impacts and lead to the decline of native species communities. Invasive alien plants pose a greater threat to the biodiversity and ecosystem stability of wetland ecosystems in Sichuan, but little is known about their background conditions. In order to comprehensively grasp the current status and spatial distribution of alien invasive plants in wetland ecosystems in Sichuan Province, ArcGIS kernel density and standard deviation ellipse analysis tools were used to explore the spatial distribution pattern of alien invasive plants in wetland ecosystems based on the data of 36,724 sampling lines, 84,304 sampling plots and 83,931 sampling squares in the province. The results showed that a total of 24,106 distribution points of invasive alien plants were recorded in Sichuan wetland ecosystems, belonging to 29 families, 68 genera and 102 species, and dominated by Compositae (32 species), Amaranthaceae (11 species) and Gramineae (8 species). In terms of origin analysis, the Americas had the most sources with 74 species (72.55%). In terms of hazard class, there are 73 (71.57%) invasive species between class 1 and class 3, of which 60 (82.19%) are of American origin. In terms of spatial distribution pattern, alien invasive plants appeared in wetland ecosystems in all surveyed sub-areas, but their obvious preference was for the Basin Plain/Hill Zone, the Southern Marginal Zone of the Basin Periphery, and the Southwest Sichuan Mountains, accounting for 88.56% of the total. From the point of view of altitude distribution, wetland invasive alien plants were mainly concentrated in the altitude below 3,000m, and the frequency of invasive alien plants in the wetland was highest in the altitude section of 300-500m. Studies have shown that Sichuan wetland ecosystems have a high number of alien invasive plant species and a clear trend of proliferation. Differences in the number of invasive alien plant species in wetlands may be related to the distribution of water resources, elevation, level of economic development, and the number of neighboring populations, with higher elevations and less anthropogenic activity inhibiting invasion of invasive alien plants in wetlands, and warmer and more isothermal climatic conditions in the native range exacerbating invasion of invasive alien plants in wetlands. The results of the study will provide a theoretical and data basis for the risk assessment of Sichuan wetland ecosystems and for future daily monitoring, manual intervention and prevention and control deployment.