Signal line with replaceable joint

The utility model discloses a signal line with a replaceable joint, which comprises a USB joint, the outer surface of one end of the USB joint is fixedly connected with data lines, the outer surface of one end of each data line is fixedly connected with a mobile phone joint, the number of the data lines and the mobile phone joint are both three groups, the outer wall of the mobile phone joint is provided with a rectangular protection frame, and the rectangular protection frame is provided with a protective cover. Limiting assemblies are fixedly mounted on the upper side and the lower side of one end of an inner cavity of each rectangular protection frame, the number of the limiting assemblies in one rectangular protection frame is three, the number of the rectangular protection frames is three, and each limiting assembly comprises a mounting block, a mounting groove, a compression spring and a limiting ball. The mounting blocks are fixedly mounted on the upper side and the lower side of one end of the inner c