The invention discloses a multifunctional data line, comprising a data connecting line, a connecting plate, a charging joint and a protective sleeve. The protective sleeve includes a first mounting shell, the second mounting shell and the third mounting shell, the first mounting shell is provided with a first mounting groove, the inner side wall of the first mounting groove is provided with firstinternal threads, the second mounting shell is provided with a second mounting groove, the inner side wall of the second mounting groove is provided with second internal threads, the third mounting shell is provided with a third mounting groove, and the inner side wall of the third mounting groove is provided with third internal threads. The invention can simultaneously connect a plurality of mobile devices with different interfaces by setting a protective sleeve, which is convenient for users to use. Moreover, the protective sleeve with thread connection is arranged on the data transmission line, so that the problem of falling-off of the protective sleeve does not occur, and the protective sleeve can realize the protection of a Type-C interface, thus the Type-C interface is not damaged, and the service life of the data transmission line is prolonged.