Abstract: Constructed wetlands have the advantages of low capital consumption and good treatment effect, etc., and it has been highly concerned by domestic and foreign scholars. The related research papers have grown significantly, but there is a relative lack of literature analysis in the field of constructed wetlands. The domestic and foreign papers on constructed wetlands in China National Knowledge Infrastructure (CNKI) core journal database and Web of Science (WoS) core collection database from 2000 to 2021 were statistically analyzed by the bibliometric methods using CiteSpace and other software. Based on the comparative analysis of the annual quantity of papers, publication countries, publication authors, research directions and research hotspot evolutions, the research trend differences at home and abroad were revealed. The results showed that from 2000 to 2021, the annual quantity of published papers on constructed wetlands research at home and abroad was on a rapid rise. The quantity of English papers published by Chinese scholars ranked first in the world in WoS core collection database. The main research direction in the field of foreign constructed wetlands also focused on the coupling of microbial fuel cell technology and the removal of emerging pollutants such as personal care products on the basis of traditional research. The main research direction in the field of domestic constructed wetlands revolved around four major categories of decontamination mechanism, decontamination efficiency, decontamination objects and their application. The use of gene sequencing technology to study constructed wetlands from a microscopic perspective, and the constructed wetland-microbial fuel cell coupling technology would be the research hotspots in the field of constructed wetlands in recent years. Constructed wetland technology had entered a mature stage, and was expected to be combined with more emerging fields in the future.