Extremely-long linear motion device only using magnetic force of magnets

The invention discloses an extremely-long linear motion device only using a magnetic force of magnets, which relates to application of magnets in power equipment and aims at solving the technical problem of using the magnetic force of the magnets and reducing an attracting force and a repulsive force. Multiple long static magnets are used, the N pole and the S pole at two ends of the magnetic axis are at two sides of a moving magnet motion line, or two ends of the N pole or the S pole in a magnetic field are at two sides of the moving magnet motion line, or two ends of the static magnet have bent parts, the lower end of the moving magnet is provided with four wheels through a support, and an extremely-long linear motion is made. A tracked vehicle can thus perform a linear motion, the input power of a rotation motion by using the magnetic force of the magnets is several times smaller than the output power, the efficiency is high, and the size is small. 本发明是只利用磁石磁力的很长直线运动装置，是磁石在动力设备中的应用。要解决的技术问题是利用磁石磁力及减小吸力斥力。用