Disclosed in the present invention are a coil-strip-shaped automatic-magnetic-attraction free-stretching data cable in a horizontal direction, and a preparation method therefor and the application thereof. The data cable sequentially comprises, from inside to outside, an innermost flexible covered object, an intermediate flexible permanent-
magnet magnetic cladding layer and an outermost flexible sheath layer, which are tightly connected. The preparation method therefor comprises the following steps: step A, performing
extrusion molding; and step B, first, performing
magnetization in a 180-degree constant
magnetic field orientation in a north-south direction, so as to form a preliminary coil-strip-shaped structure in a horizontal direction, and then performing
magnetization again to form a coil-strip-shaped automatic-magnetic-attraction free-stretching data cable in the horizontal direction. The present application is aimed at solving the problem in the prior art of insufficient automatic coiling and magnetic attraction of a data cable. By means of improving a
magnetization mode, the present application makes a magnetization operation safe and reliable, and is
environmentally friendly, human-health-friendly, easily implementable and
mass-production-ready. The present application enables fuller utilization of the magnetic properties of a
samarium-iron-
nitrogen magnet, a
magnetocrystalline anisotropy field of which significantly exceeds other permanent
magnet materials, thereby making the data cable resistant to high temperature,
corrosion and demagnetization, providing distinct advantages, and breaking through the limitation of relying on an increased
magnetic layer thickness to meet attraction force requirements of the data cable.