Monitoring studies have shown that the Longgang volcanic area exhibits relatively high levels of seismicity and crustal activity. However, current monitoring approaches are limited, and gas geochemical surveys have not yet been conducted. This study focuses on the Jinlongdingzi volcano, a Holocene volcano within the Longgang volcanic field, by conducting soil gas surveys(CO₂, CH₄, etc.) to access volcanic degassing characteristics. The results indicate that the soil microseepage CO₂ concentrations range from 0.06% to 0.33%, with CO₂ flux values between 4.28 and 160.13g/(m²·d) (mean:53.33g/(m²·d). The estimated annual CO₂ emission from the volcanic area is approximately 0.73×10⁶ t. The release of volcanic greenhouse gases is primarily associated with moderate-to-low temperature geothermal activity, suggesting a relatively quiescent volcanic state. Furthermore, anomalous zones with elevated Rn concentrations were detected, possibly indicating underlying concealed faults.