The plant which are introduced as alien, non-indigenous, exotic, non-native to the location but very aggressive causing damage to the other plant species, health of human and economic structure known as invasive plants which leads to biodiversity losses. AIS are a significant problem to our State, since they impact deeply on native biodiversity, productivity and results in landscape level changes. The problem needs crucial attention. In the present study evaluates the risk and diversity of alien invasive species (AIS) to Kottamkara Grama Panchayat, Kollam, Kerala. Based on the field survey, 20 exotic weed species, belonging 11 families were recorded. Among them Asteraceae and Amaranthaceae are the ruling families with 4 species each. The place of origin of the AIS happens to be Tropical America for 6 species, South America for 2 species, North America for 3 species, Asia for 1 species, Tropical Africa for 3 species and West Indies for 1 species. The present study detected the highly aggressive established exotic plant colonies from the study sites. Among this Tridax procumbens, Alternanthera tenella and Chromolaena odorata were the most aggressive colonizers in Kottamkara Grama Panchayat.