The invention discloses a multifunctional illuminating lamp for a vehicle. The lamp comprises a lamp mounting base and an illuminating lamp body, the lamp mounting base is of a box-shaped structure and can be mounted on a metal plate of an automobile, the illuminating lamp body comprises a lamp shell and an illuminating light-emitting face arranged on the lamp shell, the lamp shell is detachably mounted on the lamp mounting base, and a light source is arranged in the lamp shell and located on the inner side of the illuminating light-emitting face. By the adoption of the technical scheme, wasteis turned into wealth, when the illuminating lamp is mounted on the lamp mounting base, the illumination light-emitting surface can provide conventional illumination, when the illuminating lamp is detached from the lamp mounting base, the illuminating lamp can be used as a flashlight, any place needing to be illuminated is illuminated, the LED lamp is good in lighting effect, extremely high in flexibility, attractive, elegant, compact in structure, convenient to store and use, extremely high in practicability, particularly suitable for being installed in a trunk of a car, a trunk of an SUV and an MPV, a pickup truck, a container of a truck and the like, wide in application range, and does not influence the appearance.