The present invention relates to the field of electronics, and more particularly to an elastic portable mobile phone data line, which comprises a plug, a fixed part and a data line, wherein the plug is used for connecting the data line to realize data transmission; the fixed part is used for fixing the plug to the back of the mobile phone and realizing flexible connection with the plug; and the data line is used for connecting an input line track and an output line track. The device can realize transmission of data and can be attached to the back of the mobile phone for carrying; the plug of the device can be rotated around the fixed part, so the place of locating the plug can be selected for different mobile phones; the suction cup of the device can increase the absorption capacity undera wet environment, so that the suction cup can be firmly absorbed on the mobile phone and is not easy to fall off after the mobile phone contacts liquid such as sweat, rain and the like; the data lineis provided with a pulling protective member, which can prevent the data line from being broken. Besides, the data line is provided with a decorative member, which can beautify the appearance of themobile phone after the data line is absorbed on the mobile phone.