This study presents a robust and high-throughput water purification system inspired by Douglas fir wood. The system integrates a structure-function integrated system using metal 3D printing and electrochemical deposition to create a metamaterial catalyst with overlapping microlattices featuring bimodal pores. This design decouples mechanical strength, mass transportation, and catalytic efficiency, resulting in a 70% overlap rate that enhances strength, surface area, and reaction kinetics compared to traditional microlattices. The metamaterial catalyst is prepared using 316 L stainless steel (mainly Fe) and decorated with Co to boost catalytic functionality. The combination of 3D printing flexibility and theoretical simulation demonstrates superior mechanical-transport-catalytic capabilities. The work highlights the rational integration of structural and functional design, offering potential for various applications such as flow catalysts, flow batteries, and functional 3D-printed materials. The system's performance is validated through experiments, showing enhanced robustness, high-throughput flow, and efficient catalysis for water purification, with a focus on the degradation of pollutants like sulfamethoxazole (SMX). The study also explores the practicality, designability, and applicability of the wood-inspired metamaterial catalyst, demonstrating its potential for real-world water treatment applications.This study presents a robust and high-throughput water purification system inspired by Douglas fir wood. The system integrates a structure-function integrated system using metal 3D printing and electrochemical deposition to create a metamaterial catalyst with overlapping microlattices featuring bimodal pores. This design decouples mechanical strength, mass transportation, and catalytic efficiency, resulting in a 70% overlap rate that enhances strength, surface area, and reaction kinetics compared to traditional microlattices. The metamaterial catalyst is prepared using 316 L stainless steel (mainly Fe) and decorated with Co to boost catalytic functionality. The combination of 3D printing flexibility and theoretical simulation demonstrates superior mechanical-transport-catalytic capabilities. The work highlights the rational integration of structural and functional design, offering potential for various applications such as flow catalysts, flow batteries, and functional 3D-printed materials. The system's performance is validated through experiments, showing enhanced robustness, high-throughput flow, and efficient catalysis for water purification, with a focus on the degradation of pollutants like sulfamethoxazole (SMX). The study also explores the practicality, designability, and applicability of the wood-inspired metamaterial catalyst, demonstrating its potential for real-world water treatment applications.