Soil salinization and freshwater scarcity are critical constraints on sustainable agriculture. Inspired by the salt-resistance mechanisms of Tamarix chinensis, this study combines textile technology to ingeniously integrate a hydrophobic PP/MXene photothermal sheath with a hydrophilic cotton core into functionalized yarns, successfully developing a Janus core-sheath evaporator (PM-CSY-F). MXene is uniformly dispersed within the PP matrix,/MXene shell, significantly enhancing internalmultiple light scattering andreflections between its layers, thereby improving photothermal conversion efficiency. In additionFurthermore, by precisely regulating the number of cotton cores, the water transport rate is tunable by adjusting the number of cotton core yarns, enablingcan be effectively modulated, achieving synergistic enhancementoptimization of efficient solar absorption and capillary-drivenrapid water deliverytransport. The sheath and nighttime radiative cooling enable self-cleaning and suppress salt accumulation. The PP matrix isolates MXene from highly alkaline water, improving stability. Under 1 kW·m-2 irradiation, the evaporator achieved a 2.34 kg·m-2·h-1 evaporation rate for saline-alkali water (150 mmol·L-1 Na+). In simulated seawater, performance improved to 2.46  kg·m-2·h-1. Outdoor tests yielded 12.99  kg·m-2 of water over 8 h. The textile-based design supports scalable manufacturing. This approach provides a viable solution for both soil remediation and freshwater generation, advancing sustainable agriculture in vulnerable regions.