The invention relates to the technical field of surface functional materials and discloses a method for improving the waterproof and light fastness performance of a packaging paper box. The surface ofthe paper box is coated with a prepared high-performance organic coating with the thickness of 0.3 to 0.4 mm and has good adsorption and bonding performance with the surface of the paper box; the coating film-forming performance is good; the organic coating is adopted so that the surface of a paper box product has excellent weather resistance, light resistance, yellowing resistance and water resistance; the paper box can be adaptive to extreme adverse weather and has excellent optical transparency, thermal stability, wear resistance and impact resistance; the packaging paper box treated by the invention has excellent waterproof and light fastness performance; an acting layer has strong wear resistance and acid and alkali resistance; the utilization function and service life of the packaging paper box are greatly improved and a specific utilization environment is met; the damage rate is reduced; the practical significance of a packaging paper box selling marker can be expanded; meanwhile, the method plays an important role in the aspect of environment protection and is a technical scheme which is extremely worthy of being popularized and applied.