The proposal of carbon peak and carbon neutrality goals has provided a clear direction for reducing carbon emissions in China and set new standards for the advancement of carbon capture technology. Direct air capture (DAC) of carbon dioxide, a novel negative emissions technology, is crucial for achieving the carbon peak and carbon neutrality goals and has garnered significant attention. As an effective carrier of technological information, patent is an important tool for analyzing technological development. It have the characteristics of rich and complete information, long coverage time, authenticity and reliability, and is an important supplement to academic journal resources. The relevant keywords of direct air capture were searched, and based on domestic and foreign patent documents, the development process of direct capture CO2 technology in the air was analyzed, the number of patent applications for direct air capture technology,the main technical forms and improvement measures were analyzed. The key patented technologies of the main research innovation subjects are highlighted, including the improvement of low-cost and high-efficiency adsorbents, the method of reducing the resistance of air circulation devices, and the coupling of direct air capture systems with other chemical systems. With the cost reduction and efficiency increase brought about by the development of technology, and the establishment of carbon trading market and carbon tariff, the air direct capture CO2 technology with negative carbon potential will receive more extensive attention. Finally, the future development direction of air direct capture CO2 technology in China was prospected.