Abstract: Karstification is a special geological phenomenon that not only sculpts breathtaking natural landscapes but also plays a significant role in carbon sequestration. The chemical reaction between carbonate rocks, carbon dioxide, and water produces bicarbonate ions. This process absorbs carbon dioxide from the atmosphere and soil, converting it into bicarbonate ions in the water. These ions are then deposited underground or absorbed by aquatic plants, effectively reducing the atmospheric concentration of carbon dioxide. This natural carbon sequestration process is crucial for mitigating global climate change and combating the greenhouse effect. Additionally, it profoundly impacts the protection and enhancement of biodiversity and the maintenance of ecological balance.This paper introduces the term “karst carbon sink,” exploring the mechanisms and potential of karst carbon sequestration. As an integral part of the Earth’s natural carbon cycle, the karst carbon sink’s potential for exploration and utilization holds strategic importance for achieving carbon neutrality and promoting sustainable development.