The demand for efficient thermal management systems in high-performance electronics and energy devices has led to increased interest in bio-inspired cooling solutions. This study presents the development of advanced ceramic/resin composites featuring 3D printed leaf-vein architectures, mimicking natural vascular systems for optimized fluid transport and heat dissipation. Inspired by the hierarchical vein networks found in plant leaves, the designed microchannel structures promote efficient liquid flow and improved thermal conductivity within the composite matrix. Through a combination of additive manufacturing techniques and materials engineering, these composites demonstrate enhanced cooling performance, mechanical robustness, and adaptability for compact systems. Experimental evaluations show that the biomimetic designs outperform traditional planar microchannels in both thermal regulation and pressure drop efficiency. The results highlight the potential of nature-inspired design strategies to revolutionize liquid cooling technologies in electronics, automotive, and aerospace applications.