The invention discloses a vehicle-mounted projection system, and belongs to the technical field of vehicles. The system comprises a transmission module, a processing module and a laser display device, wherein the transmission module is used for receiving navigation data; the processing module is used for processing the navigation data to obtain a navigation picture; the laser display device is used for projecting the navigation picture to an appointed position at a front roadway of the vehicle. The navigation picture of the vehicle is projected to the front roadway of the vehicle in a laser display mode, the visibility is improved, and the projection effect is guaranteed.