[Aim] This study aimed to determine the invasive status of alien plants in Leshan, to provide strategies for their prevention and control, and scientific guidance for the establishment of early warning mechanisms.[Method] Data about invasive alien species were collected through literature review, specimen records, and field investigations. We used the analytic hierarchy process to assess the relative invasion risk of each species and classified them into five invasion risk grades (I-V).[Result] A total of 109 invasive alien species were identified, belonging to 86 genera and 38 families. Asteraceae represented the most species (20 species belonging to 17 genera), followed by Leguminosae, Amaranthaceae, Solanaceae, and Poaceae. Herbaceous species were the most common. Out of all identified species, 10 were aggressively invasive (grade I), 11 were seriously invasive (grade II), 13 were locally invasive (grade III), 27 were generally invasive (grade IV), and 48 required further analysis (grade V). There were 34 species with medium or high risks, belonging to 32 genera and 18 families.[Conclusion] There are many alien invasive plant species in Leshan, a relatively high proportion of which are high-risk. We suggest strategies the prevention and control of invasive alien plants according to their assessed risk grade.