The utility model relates to a USB data line comprising a line body and a protection sleeve. A first pedestal and a second pedestal are arranged at the line body, wherein the first pedestal and the second pedestal can be in a butt joint to form a cylinder; a first bar-shaped groove is formed in the first pedestal; and a second bar-shaped groove is formed in the second pedestal. A connecting rope is arranged at the closing end of the protection sleeve and the opening end is used for connecting the cylinder; and a first protruding bar and a second protruding bar are arranged at the inner wall of the protection sleeve. The two pedestals of the line body are in butt joint and then are connected with the protection sleeve to form an integrated body; and the integrated body is connected to a mobile electronic device by the connecting rope and is used as a hanging ornament, so that the decoration and the function are unified into one; and the whole unit can be carried and used conveniently. The protection sleeve can accommodate a first USB head and a second USB head for protection. On the basis of cooperation between the first bar-shaped groove and the second bar-shaped groove and the first protruding bar and the second protruding bar, the rotating cooperation between the cylinder and the protection sleeve can be realized and the cylinder and the protection sleeve can be localized axially. Therefore, connection and separation of the protection sleeve and the two pedestals can be realized during the rotation process of the protection sleeve. The USB data line can be used conveniently; and the whole structure is simple and the processing cost is low.