The invention relates to a method for switching between video signal transmission and audio signal transmission, and aims to solve the problem that a single socket can only provide a single transmission wire plug for use. The switching method comprises the following steps of: judging whether the transmission wire plug is a video signal transmission wire plug or an audio signal transmission wire plug; producing a judgment signal according to a judgment result; controlling a switch according to the judgment signal; and switching a transmission channel into a video signal transmission channel oran audio signal transmission channel through the switch so as to perform signal transmission of the video signal or the audio signal. Therefore, a user can perform different signal transmission operations by only directly replacing different transmission wires. Furthermore, the invention also discloses a system for switching between video signal transmission and audio signal transmission.