Cell phone plug device capable of being locked automatically

A cell phone plug device capable of being locked automatically comprises a cable (1), a shell portion (2) and an insertion portion (3), wherein the left side of the shell portion (2) is connected with the cable (1), and the insertion portion (3) extends from the right side of the shell portion (2). A cavity (20) is formed in the shell portion (2); the position, close to the shell portion (2), of the insertion portion (3) is provided with a cavity (30) communicated with the cavity (20); the left portion, opposite to the cavity (30) of the insertion portion (3), namely the portion, far away from the cavity (20), of the insertion portion (3), is solid; metal contact strips (39) are arranged on the upper side face and the lower side face of the left portion of the insertion portion (3) to be electrically connected with a cell phone; the right end face of the insertion portion (3) is provided with a contact sensing contact (38) used for sensing contact with the bottom of a socket of the cell phone.