<p>The advancement of wearable electronics, especially smart clothing, is limited by the rigidity and bulkiness of conventional power sources, highlighting the need for sustainable energy solutions. Textile-based triboelectric nanogenerators (T-TENGs) offer a promising approach for harvesting biomechanical energy and enabling self-powered sensing. However, traditional planar or simple 3D T-TENG structures often struggle to adapt efficiently to complex human motions, resulting in reduced electrical output and stability. In this study, we present a mechano-intelligent auxetic triboelectric textile (MIA-TENG) that integrates auxetic structures into the fabric to actively enhance contact and separation dynamics at the triboelectric interface. The MIA-TENG, fabricated from a composite of polydimethylsiloxane (PDMS) and nylon fabric, leverages the negative Poisson’s ratio effect of auxetic structures to enhance output performance with wearing comfort. Experimental results show that the MIA-TENG achieves a peak power output of 3610 mW m⁻² and maintains excellent durability and washability, with a stable performance after 10 washing cycles and 60,000 mechanical tests. The device can power portable electronics and is suitable for both large-joint protection and high-fidelity gesture sensing. Combined with machine learning algorithms, the system enables accurate gesture recognition, offering an integrated platform for advanced applications in motion capture, health monitoring, and smart sports.</p> Graphical Abstract <p></p>