A wood-inspired metamaterial catalyst is developed for robust and high-throughput water purification. This catalyst is designed with overlapping microlattices and bimodal pores, inspired by the structure of Douglas fir wood, to decouple mechanical strength, mass transport, and catalytic efficiency. The catalyst is fabricated using metal 3D printing (316 L stainless steel, mainly Fe) and electrochemically decorated with Co to enhance catalytic performance. The design allows for a wide range of mechanical-transport-catalytic capabilities, with a 70% overlap rate providing 3X more strength and surface area per unit volume, and 4X normalized reaction kinetics compared to traditional microlattices. The catalyst demonstrates superior mechanical robustness, high-throughput flow, and high-efficiency catalysis, making it suitable for water purification applications. The wood-inspired design also enhances the catalyst's ability to remove harmful pollutants such as dyes, heavy metals, and antibiotics. The catalyst's performance is validated through experiments showing its effectiveness in degrading sulfamethoxazole (SMX) and other organic pollutants. The catalyst's design is flexible and scalable, with potential applications in various water treatment scenarios. The study highlights the integration of structural and functional design in water purification systems, offering a promising solution for efficient and sustainable water treatment.A wood-inspired metamaterial catalyst is developed for robust and high-throughput water purification. This catalyst is designed with overlapping microlattices and bimodal pores, inspired by the structure of Douglas fir wood, to decouple mechanical strength, mass transport, and catalytic efficiency. The catalyst is fabricated using metal 3D printing (316 L stainless steel, mainly Fe) and electrochemically decorated with Co to enhance catalytic performance. The design allows for a wide range of mechanical-transport-catalytic capabilities, with a 70% overlap rate providing 3X more strength and surface area per unit volume, and 4X normalized reaction kinetics compared to traditional microlattices. The catalyst demonstrates superior mechanical robustness, high-throughput flow, and high-efficiency catalysis, making it suitable for water purification applications. The wood-inspired design also enhances the catalyst's ability to remove harmful pollutants such as dyes, heavy metals, and antibiotics. The catalyst's performance is validated through experiments showing its effectiveness in degrading sulfamethoxazole (SMX) and other organic pollutants. The catalyst's design is flexible and scalable, with potential applications in various water treatment scenarios. The study highlights the integration of structural and functional design in water purification systems, offering a promising solution for efficient and sustainable water treatment.