The utility model discloses a portable double-line coiling and uncoiling device, which comprises a support and two line boxes. The support is provided with a spindle used for installing the line boxes. A section of internal tooth is arranged in the hole wall of one end of a line box axle hole, and the other end of the line box axle hole is equipped with a unthreaded hole which shares the equivalent length with the internal tooth section of the line box axle hole and has the same inner diameter. The middle portion of the spindle is provided with a section of external tooth with the length being equivalent to or greater than two sections of the internal tooth of the line box axle hole or two sections of external tooth which has the length equivalent to or greater than the length of one section of the line box internal tooth and is engaged with the internal tooth. The rest part of the spindle is the optical axis which fits with the unthreaded hole on the middle portion of the line box. The two line boxes are detachably and movably connected at two ends of the spindle. By the adoption of the portable double-line coiling and uncoiling device, one worker can coil and uncoil two wires through two coaxially-rotating turnplates at the same time such that work efficiency is significantly raised. The device is prepared from plastics used as a raw material. Thus, the device is light and easy to carry and use. The whole weight of the device is light.