Vehicle-mounted reverse video display method and device

The invention relates to a vehicle-mounted reverse video display method. The method comprises the steps that a reverse signal is detected; when the reverse signal is detected, the operation phase of a vehicle-mounted system is determined; when the vehicle-mounted system does not complete boot, a reverse system is loaded through a guide program; a reverse video is displayed through the reverse system; and the reverse system and the vehicle-mounted system share a processor. When vehicle-mounted system does not complete boot, the reverse system dedicated to a reverse task is loaded through the guide program. The loading speed of the reverse system is faster than that of the vehicle-mounted system, so that the reverse video can be quickly displayed. In addition, the invention further provides a vehicle-mounted reverse video display device.