Micro magnetic steel for smart wearable devices is ultra-miniature high-precision neodymium magnetic components specially developed for smart watches, smart bracelets, wireless Bluetooth earphones, smart glasses and wearable health monitoring equipment. Smart wearable devices have the characteristics of ultra-light, ultra-thin, miniaturization and high integration, and the internal assembly space is extremely narrow, which puts forward stringent requirements on the volume, precision, weight, performance stability and safety of magnetic accessories. This series of micro magnetic steel breaks through the traditional magnet size limitation, realizing ultra-small size, ultra-thin thickness and high-precision molding, while maintaining high magnetic density and stable magnetic performance, fully adapting to the structural design and functional requirements of smart wearable devices. Made of high-purity high-performance neodymium-iron-boron materials and ultra-precision wire cutting and mirror polishing process, the micro magnetic steel has precise size control up to 0.01mm level, smooth and flawless surface, no sharp edges and corners, and will not scratch the internal precision circuits and flexible components of wearable devices. In terms of performance, the product has high magnetic energy product and stable magnetic field distribution, which can meet the functional needs of wearable devices such as magnetic adsorption charging, magnetic induction switching, wearing fixation, sensor positioning and magnetic conduction detection. For example, it is used for magnetic suction fixation of watch straps, magnetic induction start and stop of Bluetooth earphones, magnetic suction charging contact positioning of wearable equipment, and health sensor magnetic positioning. The magnetic force is precise and stable, which can realize sensitive induction and firm fixation, and will not produce magnetic interference to the internal precision electronic components and sensor modules of wearable devices, ensuring the accurate operation of equipment functions. The surface adopts imported environmental protection anti-corrosion and insulating coating, which is anti-oxidation, anti-wear, insulating and anti-static, effectively avoiding short circuit and signal interference caused by metal magnet conduction, and improving the safety and stability of equipment operation. The micro magnetic steel is light in weight, which will not increase the overall load of wearable devices, ensuring the lightweight wearing experience of users. It has excellent temperature resistance and low temperature stability, can adapt to the human body temperature environment and outdoor temperature changes, and maintains stable magnetic performance during long-term wearing and repeated use. The products support personalized customization of special shapes, ultra-small sizes and designated magnetic strength, covering all kinds of structural and functional magnetic requirements of mainstream smart wearable devices on the market. With the continuous innovation of wearable technology, micro magnetic steel has become a core basic accessory for the functional upgrading and structural optimization of smart wearable devices, helping wearable products realize more intelligent, lightweight and humanized functional design.