Projection system and projection method of automobile rearview mirror projector

The invention provides a projection system and a projection method of an automobile rearview mirror projector, which are applied to the field of automobile body advertisements. The projection system comprises a vehicle-mounted terminal and a projector which are in communication connection. The vehicle-mounted terminal acquires an advertisement image, sends the advertisement image to the projectorand outputs a projection instruction to instruct the projector to project; after the projector obtains the advertisement image and the projection instruction, the advertisement image is projected to aprojection area of a vehicle body; the vehicle body advertisement can be replaced by a user without spraying, pasting and other modes, so that the advertisement cleaning process is not needed, the environmental protection property is improved, the vehicle body advertisement can be displayed according to the putting time period, and the driving safety is guaranteed. 本申请提供了一种汽车后视镜投影仪的投影系统与投影方法，运用于车身广告领域，包括车载终端和投影器，所述车载终端与投影