Photosensitive hydrogels represent an emerging class of photothermal composites with significant potential for application in solar-driven atmospheric water harvesting (SAWH). However, many existing SAWHs are challenged by the difficulty of balancing high water sorption capacity with efficient desorption kinetics, alongside environmental sustainability concerns. To address these limitations, this study developed an eco-friendly and cost-effective super-hygroscopic hydrogel based on polyaspartic acid (PASP), incorporating carbonized rapeseed pollen shell (CRPS) and sodium chloride (NaCl). This novel composite facilitates spontaneous atmospheric water vapor capture and release under solar irradiation. The CRPS component retains a hollow, porous carbon skeleton that promotes efficient broadband light absorption by extending the optical path length via internal multiple scattering and reflection. Concurrently, the hollow cavities inherent to the structure provide substantial void volume for the impregnation of hygroscopic salts, thereby synergistically enhancing both the moisture uptake and subsequent solar-driven release. Under simulated arid environmental conditions, the CRPS-PASP hydrogel demonstrated exceptional atmospheric water harvesting performance, achieving a water uptake of 1.65 g g(-1) within 3 h. When subjected to solar irradiation at an intensity of 800 W m(-2), the residual water content within the hydrogel decreased rapidly from 100 % to 30 % within 50 min, corresponding to an average desorption rate of 1.4 % min(-1). By concurrently integrating strong hygroscopicity with high photothermal efficiency, this work presents an efficient, economical, and sustainable strategy for atmospheric water extraction, offering a promising avenue to mitigate water scarcity in arid regions.