The eco-friendly cellulosic paper-based mulch film has become an alternative to petroleum-based plastics. However, the integration of black, hydrophobic and high mechanical performances into cellulose mulch film still remained challenge. Herein, multifunctional (P/SLS-Fe/CA) black mulch film with the sandwich structure was designed by layer-by-layer assembly (LBL) strategy using filter paper (P) as the substrate, sodium lignosulfonate chelated with iron (SLS-Fe) as black factor and cellulose acetate (CA) as the hydrophobic layer. The quinone structure formed by the chelation and redox reaction between Fe³⁺ and SLS induced the color change from brown-yellow to black of lignin. Moreover, the dynamic reversible physical bonds between P, SLS-Fe and CA endowed the composite with enhanced mechanical performance. The dry and wet tensile strength of the composite were 1.6 times and 21.3 times higher than pristine filter paper, respectively. The water contact angle increased from 58.4º for pure filter paper to 138.7º for the optimized P/SLS-Fe₄/CA. Furthermore, the prepared black paper-mulch has low water vapor transmittance, heat preservation properties and good water resistance, which promote the growth of cabbage seeds. This work provides a prototype for the design and preparation of black cellulose fiber base membrane, and promotes the green development of agriculture.

环保的纤维素纸基地膜已成为石油基塑料的替代品。然而，将黑色、疏水性和高机械性能整合到纤维素地膜中仍然面临挑战。本文以滤纸（P）为基材，铁螯合木质素磺酸钠（SLS- Fe）作为黑色因子，醋酸纤维素（CA）作为疏水层。 Fe ³⁺ 与SLS发生螯合和氧化还原反应形成的醌结构导致木质素颜色由棕黄色变为黑色。此外，P、SLS-Fe和CA之间的动态可逆物理键赋予复合材料增强的机械性能。复合材料的干拉伸强度和湿拉伸强度分别比原始滤纸高1.6倍和21.3倍。水接触角从纯滤纸的 58.4° 增加到优化的 P/SLS-Fe ₄ /CA 的 138.7°。而且制备的黑色地膜水蒸气透过率低、保温性能好、耐水性好，有利于甘蓝种子的生长。该工作为黑色纤维素纤维基膜的设计和制备提供了原型，促进农业绿色发展。