Single-crystal diamond, renowned for its exceptional strength and hardness, is widely sharpened into cutting tools for precision machining. However, even minor tool wear during ultra-precision cutting detrimentally impacts workpiece surface quality. While micro-textures have been applied to mitigate tool wear, the optimal texture configuration for wear reduction in ultra-precision machining remains underexplored. Additionally, achieving high-quality fabrication of complex array micro-structures on hard and brittle diamond substrates poses significant challenges. In this study, femtosecond laser processing was utilized to fabricate micro-structures on single-crystal diamond surfaces. A regression model for micro-groove dimensions was established using response surface methodology, elucidating the effects of laser parameters and their interactions on groove geometry. Optimized parameters enabled the fabrication of micro-structures free from heat-affected zones. Subsequently, bioinspired hexagonal micro/nano-textures were engineered on the rake faces of single-crystal diamond tools, and ultra-precision cutting experiments on oxygen-free copper demonstrated that the horizontal hexagonal texture reduced wear widths on the rake and flank faces by 36.74 % and 36.63 %, respectively. This work provides critical insights into texture design and precision manufacturing of diamond tools for enhanced machining performance.