Direct air capture (DAC) technology is a powerful carbon removal method with tremendous potential in addressing CO_2 emissions and supporting the achievement of future carbon neutrality. Solida mine adsorbents offer advantages in DAC applications due to their low energy consumption and flexible layout, making them a promising technological approach, This review discusses the mechanism of CO_2 adsorption and then introduces the characteristics of four preparation methods for solid amine adsorbents, comparing them in terms of commonly used amine sources, capture capacity, amine eficiency, and cycling stability. Finally, the review summarizes the main challenges and future development directions for solid amine adsorbents in DAC. For broader applications, high adsorption performance and low preparation costs are critical. To achieve this, integrating solid amine adsorbents with green energy, CO_2 resource utilization, and other systems can improve the commercial viability of the technology andpromote its large-scale applications. Development of high-eficiency adsorbents and modular capture devices will be the core focus of future studies in this aera.