[Aim] To investigate the status of alien invasive plants and provide basic data for early warning, prevention, control, and ecosystem protection on the sandy coasts of Jiangmen City. [Method] Field investigations and plant community quadrat investigations were conducted to analyze the species composition, origin, flora, and functional traits of alien invasive plants on the sandy coasts of Jiangmen City. [Result] A total of 22 invasive alien species were identified, belonging to 22 genera and 12 families, with Bidens pilosa being the most frequently occurring species (90.91%). Asteraceae (six species), Poaceae (three species), and Fabaceae (three species) were the most abundant families, accounting for 27.27%, 13.64%, and 13.64% of the total number of species, respectively. According to threat grade (TD) assessment, 68.18% (highest) of the total number of species fell under most threatening invasive (grade I) or serious invasion species (grade II) grades. Most of the invasive alien plants showed pantropic, tropical Asia and tropical America distribution. The highest (83.33%) number of species originated from America. The growth type was dominated by herbaceous plants (68.18%), and the growth form was dominated by hemicryptophytes and therophytes (54.54%). Achene was the most common fruit type (31.82%). [Conclusion] The situation of alien plant invasion on the sandy coasts of Jiangmen City is serious and may pose a great threat to the local ecosystem. Therefore, improving prevention and control measures against invasive alien plants, restoring damaged habitats according to local conditions, promoting the application of indigenous plants, and establishing coastal protection forests are required.