The invention provides an automobile inside rearview mirror video switching method and device. The method includes the steps that firstly, a display channel is switched to a default video channel, and a default video picture is displayed; secondly, the vehicle front side road condition danger degree DF and the vehicle rear side road condition danger degree DR are confirmed; thirdly, navigation information and vehicle state information are obtained, and the emergency degree E of the navigation information is confirmed; and fourthly, switching of the video channel is determined according to the vehicle front side road condition danger degree DF, the vehicle rear side road condition danger degree DR and the emergency degree E of the navigation information. By the adoption of the method and device, the displayed picture of an automobile inside rearview mirror is automatically switched.