Abstract: The large-scale emission of carbon dioxide (CO₂) has caused a series of environmental problems. The direct conversion of CO₂ to solid carbon by electrochemical technology has the advantages of low cost, high conversion efficiency and high product selectivity. Moreover, the nanostructured carbon has high economic value. This paper describes the basic principles of converting CO₂ to solid carbon using molten salt electrolysis technology. The research progress of electrolytic lithium carbonate and non-lithium carbonate are analyzed respectively. The economic benefits of converting CO₂ to solid carbon by using molten salt electrolysis technology are analyzed, and several production models that are expected to achieve large-scale commercial application are listed. The properties of liquid metal are introduced, the breakthrough progress of liquid-metal-based catalysts in the field of direct conversion of CO₂ to solid carbon, and the main economic indicators of this technology are analyzed. Finally, the technical issues in direct conversion of CO₂ to solid carbon based on electrochemistry are prospected.