This disclosure provides an active audio and video signal transmission device, which comprises a cable, a display-side connector, and a signal source connector. The cable comprises a first end and a second end. The display-side connector comprises a first shell, a first circuit board configured within the first shell, a first plug configured on the first circuit board and protruded from the first shell, a repeater configured on the first circuit board and electrically connected to the first plug and the first end of the cable, and a microprocessor. The microprocessor is configured on the first circuit board, electrically connected to the repeater, and used for controlling an operation of the repeater. The signal source connector is connected to the second end of the cable. In the disclosure, the repeater is only configured within the display-side connector, and is not configured within the signal source connector.