Insects and microbes have established complex symbiotic relationships during their long co-evolutionary history. Host-associated microbiota can affect the spread and outbreaks of their hosts by manipulating host phenotype or ecological adaptation, especially in invasive pest species. In turn, both host genotypes and environmental factors shape the structure and function of host-microbiota during the invasion process. Thus, understanding the processes that drive the leaf miner microbiotic assembly is imperative for understanding the invasion process and potential for damage of this invasive species. Leaf miner Liriomyza flies cause severe damage to numerous ornamental and vegetable crops. Three highly polyphagous leaf miner species, L. trifolii, L. sativae and L. huidobrensis, have now spread to multiple regions of China and have become the dominant pest of numerous ornamental and vegetable crops, posing a major threat to agricultural production. In this paper, we summarize current research on the status, diversity, composition, community assembly and function, of the bacterial microbiota of invasive leaf miners. This information provides a foundation for understanding interactions between leaf miners and their bacterial microbiota, and for designing environmentally-friendly, efficient pest control strategies by targeting these endosymbionts.