Materials of under-liquids (water/oil) dual super-lyophobicity require special micro/nano morphology. However, such material surfaces are mechanically weak and readily worn, which restricts their practical applications. Herein, we report a robust self-similar under-liquid dual super-lyophobicity anti-fouling cement which demonstrates stable underwater super-oleophobicity (θ_o/w > 150°) and under oil super-hydrophobicity (θ_w/o > 150°) via a simply mixed cement and water, without other organic reagents and professional preparation technology. The obtained material not only owns good under-liquids mechanical robustness but also has very excellent anti-fouling property. This surface material still has the anti-oil-fouling property once its surface is mechanically damaged, due to its surface self-similar functionality. Importantly, the surface maintained their excellent super-lyophobic functionality due to the similar property after turbulent jets (5 m range), abrasive belt wear, blade cutting (transverse cutting), highly-viscous tape peeling (VHB, 3 M), and ASTM standard adhesion (scratch spacing and cutting spacing). Cement could separate from oil/water mixtures, the separation efficiency for oil was above 97.5% at 30 cycles. Our study provides an eco-friendly, green, simple, low-cost, and easily mass-produced strategy to the fabrication of super-lyophobic materials in oil/water systems dual functional materials, which will benefit applications in diverse fields.

液体（水/油）双重超疏液材料需要特殊的微/纳米形态。然而，这种材料表面机械强度低且容易磨损，这限制了它们的实际应用。在此，我们报告了一种坚固的自相似液下双重超疏油防污水泥，它表现出稳定的水下超疏油性（θ _{o / w}  > 150°）和油下超疏水性（θ _{w / o} > 150°）通过简单混合的水泥和水，无需其他有机试剂和专业的制备技术。所得材料不仅具有良好的液下机械强度，而且具有非常优异的防污性能。这种表面材料由于其表面自相似功能，在其表面受到机械损伤后仍具有抗油污性能。重要的是，由于在湍流喷射（5 m 范围）、砂带磨损、刀片切割（横向切割）、高粘性胶带剥离（VHB，3 M）和 ASTM 之后具有相似的特性，该表面保持了其出色的超疏液功能标准附着力（划痕间距和切割间距）。水泥可以从油水混合物中分离出来，30次循环油的分离效率在97.5%以上。我们的研究提供了一种环保、绿色、