The work aims to summarize the application of conductive polymers in gas sensor, so as to provide guidance for the subsequent conductive polymer sensor of low concentration mixed gas. The research status of conductive polymers in gas sensor was combed and analyzed. From the perspective of synthesis and structure characteristics, the action mechanism of different conductive polymers (such as polyaniline, polypyrrole, polythiophene, polyurethane, etc.) was investigated and the future development of gas sensitive materials of conductive polymers was prospected. The conductive polymers had the advantages of light weight, easy molding, wide adjusting range and wide conductivity range, and its gas sensitivity could be effectively improved by structural design, chemical modification and radiation crosslinking. Conductive polymers can effectively fill the gap in the detection of low concentration harmful gases and have a very broad development prospect.