The utility model discloses a USB automatic identification multifunction converter which comprises a signal conversion module, an automatic identification module and a connection module, wherein the signal conversion module converts a USB signal into a TTL (transistor-transistor logic) series signal and transmits the converted signal to the automatic identification module; the automatic identification module judges the property of a load used by a user and implements automatic identification and linking on different data channels according to a judged result; and the connection module is connected with an external signal and implements power supply output. The USB automatic identification multifunction converter has small size and low cost; as long as the USB automatic identification multifunction converter is connected with a USB interface of a computer, no power supply is needed to be additionally arranged, thereby being convenient to use and being simple to maintain; a mature USB interface circuit is adopted, the circuit is controlled by a single chip microcomputer STC89C51, thereby being stable; moreover, the USB automatic identification multifunction converter can also supply power to the outside, thereby meeting using requirements of people.