Diaphorina citri Kuwayama is an important insect vector of the pathogen that causes citrus greening disease or Huanglongbing (HLB), a disease that poses an extremely grave threat to the world’s citrus industry, including China’s. Diaphorencyrtus aligarhensis（Shaffe, Alam and Agarwal）is an endoparasitoid of D. citri that is found in China and other countries, and which performs an important role in the biological control of D. citri. This paper reviews the latest advances in research on D. aligarhensis, including its taxonomic status, morphological characteristics, distribution, growth and development, reproductive capacity, longevity, parasitic behavior, rearing technology and application as a biological control agent. We also analyze current problems and trends in the application of D. aligarhensis. This review provides an important reference for the biological control of D. citri, and is expected to contribute to the healthy, stable and sustainable, development of China’ citrus industry.