The invention discloses a portable multi-functional data storage, transmission and connection device, which comprises a protecting grill, a short data wire, a terminal A and a terminal B of the data connecting wire are connected with the two ends of the short data wire. A nut port A and a nut port B of the connecting wire are arranged on the protecting grill of the data connection device and are respectively correspondent to the terminal A and the terminal B of the data connecting wire; an integrated circuit plate is arranged in the protecting grill; the integrated circuit plate is provided with a data storage chip, a lithium battery and a coming-call induced circuit, a coming-call luminotron as well as a mike, a note amplifier, a wireless transmission and receiving chip; the device also comprises an alarm magnetic card which is used proportionally. The invention is a portable multi-functional data connection device integrating data interacting, wireless transmission and reception, vehicle hand-free phone, coming-call twinkling, emergent charging, lost property alarming and data wire terminal protection into one body, which solves the existing problems of long wire, easy damage, inconvenient to carry and less functions in the present data wire.