The invention discloses a device capable of realizing installation of a vehicle-mounted projector. The device comprises the vehicle-mounted projector and a vehicle body connecting part bracket, wherein a vehicle-mounted projector support plate is fixed on the lower surface of the vehicle-mounted projector through a bolt; one end of the vehicle-mounted projector is connected with a vehicle-mountedprojector data line; a vehicle-mounted projector light path route is arranged at the other end of the vehicle-mounted projector; and one end of the vehicle-mounted projector light path route is projected to automobile backstop glass. According to the device, through connection of the vehicle-mounted projector support plate, a vehicle-mounted projector support chassis and the vehicle body connecting part bracket, the vehicle-mounted projector is fixed, a projected image is projected to the automobile backstop glass; and function guarantee is realized through the simple, reliable and low-cost mechanism manner, stable and reliable operation is realized, the projected image effect is ensured, the cost is reduced, the mounting difficulty is greatly improved, and time is saved for installation.