The invention belongs to the field of water treatment. A photocatalysis treatment device comprises multiple transparent pipes, ultraviolet light sources arranged in the transparent pipes, a photocatalyst coating the transparent pipes and a drive mechanism for driving the transparent pipes to rotate. The photocatalysis treatment device has the following beneficial effects: the ultraviolet light sources are arranged in the transparent pipes and can directly act on the photocatalyst, the utilization rate of ultraviolet light is increased, and the phenomenon of dim light in the depth of sewage and consequent bad photocatalysis effect is avoided; and meanwhile, since the transparent pipes can rotate, the contact probability between the photocatalyst and organic pollutants in the sewage is increased, and the treatment effect is further improved.