The invention belongs to the technical field of high molecular materials, and discloses a method for preparing anti-static polyethylene by means of ultraviolet irradiation. The preparation method comprises the steps that 100 parts by weight of polyethylene, 3-25 parts by weight of polyethylene glycol and 0.1-4.0 parts by weight of photosensitizer are mixed to be uniform, and a mixed material is obtained; the mixed material is added into an extruding machine, the extruding machine is started for extruding, an ultraviolet lamp at a light-through opening is started simultaneously for an irradiation reaction, and the extruded product is polyethylene glycol-grafted anti-static polyethylene, wherein the light-through opening is formed in a charging barrel of the extruding machine. According to the method for preparing anti-static polyethylene by means of ultraviolet irradiation, anti-static polyethylene is prepared in the extruding machine under ultraviolet irradiation, equipment is simple, and the reaction is rapid; the obtained product is good in anti-static effect and more stable and durable.