A gas detecting and purifying device is disclosed and comprises a supporting frame and a gas detector, the gas detector is disposed within the supporting frame. The gas detector comprises a main body, at least one gas detecting module, at least one particle detecting module and at least one gas purifying module; the gas detector which is disposed within the supporting frame can purify ambient the gas around a user, thereby to prevent from the injury and ill influence on human health caused by the exposure of the air pollution in the environment, and the gas detector can provide a gas detecting information, so as to provide an air quality notification mechanism, and the user can take protective actions accordingly.一種氣體監測及淨化裝置,包含:一支撐框體及一氣體監測機,嵌置於該支撐框體中定位,氣體監測機包含:一本體、至少一氣體監測模組、至少一微粒監測模組及至少一淨化氣體模組;藉此該支撐框體上所嵌設氣體監測機來淨化使用者周遭環境之氣體,以降低環境中的空汙氣體暴露所造成人體健康影響及傷害,以及透過該氣體監測機提供氣體監測資訊,進而提供空氣品質通報機制給使用者實施防護措施。