Abstract: In recent years, flexible capacitive pressure sensors have been widely used in medical diagnosis, electronic skin, artificial intelligence and other important fields due to their excellent mechanical properties and good sensitivity. In order to improve the sensitivity of the capacitive flexible sensor, a flexible capacitive pressure sensor with a three-dimensional network cross-linked multi-wall carbon nanotubes (MWCNTs)/polydimethylsilane (PDMS) sponge as the dielectric layer was designed based on multi-directional freezing process. The manufacturing process, sensing mechanism, response performance and human suitability of the sensor were characterized. The results show that: The three-dimensional network structure of MWCNTs/PDMS sponge dielectric layer is successfully constructed by multi-direction freezing method, and the flexible capacitive is assembled by this dieletric layer. It has high sensitivity (~1.94 kPa⁻¹), low detection limit (~4 Pa), fast response time (~250 ms), good stability and human suitability. The flexible sensor has a good application prospect in wearable electronic products.