【Aim】 This study aimed to determine the invasibility of alien invasive plants in Pingtan uninhabited islands, to provide basic data for prevention and island restoration. 【Method】 The survey of alien invasive plants in Pingtan uninhabited islands was carried out by using the combination of sample line method and quadrat method. The family and genus composition, floristic geographical composition, plant functional traits, origin and invasion grade were statistically analyzed and compared with other island areas. 【Result】 A total of 30 species alien invasive plants were identified in Pingtan uninhabited islands, belonging to 26 genera and 15 families. Asteraceae and Amaranthaceae were the most dominant. The geographical components of family and genus were mainly from tropical origin. Most life forms and growth forms were mainly annual herbs. The leaf with microphyll, papery, pilous leaf had the highest frequency. Most species reproduced by seeds with fruits and seeds being miniature capsule, achene and utricle. The main origin of the species was the Americas, and invasion is mostly man-made or other unintentional introduction. The impacts were diverse and destructive. The frequency of 8 invasive plants was 27.78%, and the characteristics of alien invasive plants in the study area are similar to those in other island areas. 【Conclusion】 There are many alien invasive plant species in Pingtan uninhabited islands, and some plants have strong invasiveness and high frequency of occurrence. It is suggested to continue to conduct background investigation of alien invasive plants in other islands of Pingtan, to carry out targeted prevention and control work.