Width-adjustable lead mobile trailer

The utility model relates to a lead paying-off device, particularly to a width-adjustable lead mobile trailer. Two tripods are of the same structure, the upper end of a rear vertical plate (9) of each tripod is provided with a hook (3), upper and lower ends of the tripod vertical plate (9) are provided with unthreaded holes (11), front end connecting angles of a downward inclined rod (4) and an upward inclined rod (10) of the tripods are provided with end part blocks (6), and the end part blocks (2) are provided with unthreaded holes (11); and the two tripods are arranged at an interval, two ends of two width adjusting rods (5) are connected with the unthreaded holes (11) of the upper and lower ends of the vertical plates (9) of the two tripods, and two ends of another width adjusting rod (5) are connected with the unthreaded holes (11) in the two tripod end part blocks (6). According to the width-adjustable lead mobile trailer, the two tripods are used to be hung on side boards of a lead vehicle, and a lead wheel disc support shaft is formed through the width adjusting rod connecting the two end part blocks, thereby facilitating paying-off of a lead wheel disc.