The invention is applicable to the technical field of sterilization, and provides a sterilization system, which comprises an ultraviolet laser and a scanning device which receives the ultraviolet laser light which is generated by the ultraviolet laser to scan and sterilize the peripheral environment. The sterilization system receives the ultraviolet laser light which is generated by the ultraviolet laser, and utilizes the ultraviolet laser light to scan and sterilize the peripheral environment, wherein the laser light has good directionality, concentrated energy and very small energy variation when the distance is increased, so the low power ultraviolet laser can be adopted (the average power of the laser is low, is only few milliwatts to dozens of milliwatts, and is lower by few magnitudes compared with an ultraviolet light with dozens of milliwatts; and the spectral range of the ultraviolet laser light is narrow, and the energy consumption of the ultraviolet laser light is greatly reduced compared with intensive pulse lights), the purpose of sterilizing a whole large environment or an oversized environmental space through scanning laser beams is realized, and accordingly, the air is purified. The sterilization system is an important breakthrough of the sterilization technology, and has an important significance in controlling and preventing transmitted disease.