A structure of a USB connector comprising an isolation chassis and an electric module is provided. The circuit board has a plurality of interconnection-terminals and a plurality of adaptor-terminals, wherein the power wave-filter module is positioned in a positive and negative power line of the circuit board and electrically connects to a first terminal and a fourth terminal of the interconnection-terminals and the signal wave-filter module is positioned in a signal line of the circuit board and electrically connects to a second terminal and a third terminal of the interconnection-terminals so as to cancel noise generated during signal transmission.