【Aim】 In 2022, a harmful scale insect was found on Psidium guajava in Xinglong Town, Wanning City, Hainan Province, and on Syzygium jambos in Limu Mountain, Qiongzhong Li and Miao Autonomous County. Herein, we report details of this pest to provide a reference for its quarantine identification, monitoring, and control. 【Method】 The identity of this scale insect was determined based on morphological observations. In this regard, we surveyed the relevant domestic and international literature, and reviewed the basic information and morphological identification characteristics of this scale insect. In addition, we performed a risk assessment based on the risk assessment index system of China for this pest. 【Result】 This insect was identified as the quarantine pest Ceroplastes stellifer, which is an invasive alien pest that has caused extensive damage of a wide range in fruit trees and ornamental plants. This is the first time that a risk-invasive pest has been found in Hainan Province. In this study, we provide details of the taxonomic status, distribution, hosts, morphological characteristics, and biology and hazards of C. stellifer. We also compiled a key to the species of Ceroplastes in China and determined a comprehensive risk value (R) of 1.72 for C. stellifer. 【Conclusion】 C. stellifer is a moderately destructive alien invasive pest in China, the spread of which is evident in the tropical areas of the country. Accordingly, heightened levels of vigilance, along with a strengthening of investigation, monitoring, and quarantine measures, are necessary in these areas to prevent the further spread of this pest.