In order to support the national science and technology plan and scientific research decision-making, the trends and frontiers of metamaterials basic research in China and the United States are compared and analyzed. Based on the papers retrieved from the SCIE database between 2000 to 2022, a comparative analysis between China and the United States from the aspects of paper output, citations, funding institutions, top research institutions and scholars, as well as research hot spots by using the method of bibliometrics, and with the help of data analysis software DDA and VOSviewer. It has been found that China is becoming a global leader in the field of metamaterials, after surpassing the United States in 2012, the publications in the field of metamaterials of China has climbed to the top in the world, and the citations rates is catching up with the United States in recent years. The number of publications of the United States has been decreasing year by year since 2018. China has been fascinated by Terahertz for a long time, the publications of China on Metasurfaces, Acoustic and Mechanical Metamaterials, and Metamaterial Absorbers has increased significantly, and research topics are more and more diversified in the past five years. At the same time, Metasurfaces, Mechanical Metamaterials, and Hyperbolic Metamaterials have been the hot topics in the United States. It is suggested that our government should provide more financial support to frontier hotspots and interdisciplinary fields such as Metasurfaces, Topology Optimization and Fabrication, and Deep Learning. Moreover, enhance international cooperation and global influence by advancing the most prominent fields of Information Metamaterials and other disciplines.