The invention belongs to the field of a laser white light source and discloses a laser white light source for simultaneous cooling of a laser diode and a fluorescent powder film. The laser white lightsource comprises the laser diode, a lens, a reflector, the fluorescent powder film, a fluorescent powder substrate, a horizontal base and a liquid cooling mechanism; the laser diode is taken as a blue light source; the lens emits light from the laser diode in the vertical direction; the reflector reflects the refracted light from the lens to the fluorescent powder film; the fluorescent powder film is mutually matched with the fluorescent powder substrate to convert the light from the reflector into white light for emission; the liquid cooling mechanism is arranged under the horizontal base and is used for reducing the temperature of the horizontal base so as to reduce the temperature of the laser diode and the fluorescent powder film, thereby realizing simultaneous cooling of the laser diode and the fluorescent powder film. Through the laser white light source disclosed by the invention, the efficient simultaneous cooling of the laser diode and the fluorescent powder film is realized,the process is simple, and the operation is convenient.