A vehicle-mounted illumination device comprising: one or more lamps that are mounted on a vehicle and illuminate with an LED, and a controller that is mounted on the vehicle; the device is powered by a storage battery within an engine compartment of the vehicle, and is controlled to emit light by a mobile phone having a Bluetooth and installed with an APP software; the controller includes a main control module, a Bluetooth module, a drive module and a battery protection module; and the lamp emits light in the following modes: white light, color light, and white light mixed with color light; the emitted light may be stroboscopic, the brightness of the emitted light may be adjusted, a color of the emitted color light may be adjusted, and the controller may be protected by a password.