Abstract: A large number of free electrons and ions can be generated by high voltage breakdown of the gas, forming a gas discharge plasma that is roughly electrically neutral to the outside world, while various processes initiated by energetic particles produce a rich variety of reactive substances in the plasma. Atmospheric pressure low-temperature plasma has non-equilibrium characteristics, and therefore maintains high reactivity at low gas temperatures. When an atmospheric pressure low-temperature plasma is in contact with a solution, a plasma electrochemical system can be formed. Charge and substance transfer at the plasma-liquid interface can lead to a series of physicochemical and electrochemical processes, which makes the plasma electrochemical system widely used in a variety of fields, and the synthesis of nanomaterials is one of the many applications. Currently, there have been a large number of studies on the synthesis of nanomaterials using plasma electrochemistry, and there are also related review articles, but there is a lack of reviews focusing on gold and silver nanoparticles and carbon quantum dots, so here we review the results of the research on the synthesis of gold and silver nanoparticles and carbon quantum dots using plasma electrochemistry in recent years. Firstly, we introduce the plasma electrochemical method, then we examine the experimental results of the synthesis of gold and silver nanoparticles and carbon quantum dots and the progress of their applications, and finally we discuss the problems and challenges encountered in the current research and try to propose solutions.