Method for improving lighting effect of LED light guide plate lamp box and LED light guide plate lamp box

The invention relates to the field of advertising lamp boxes. The invention particularly relates to a method for improving the lighting effect of an LED light guide plate lamp box. The method comprises the steps of obtaining a to-be-displayed picture, cutting the to-be-displayed picture according to colors, dividing the to-be-displayed picture into a plurality of small-area single-color pictures,calculating the radius of each diffusion point in each small area, obtaining the gray-scale value of each small area, calculating the distance between the diffusion points in each small area, and filling the diffusion points with fluorescent powder according to the color of each small area. The intervals of the diffusion points are set according to the gray-scale values of the to-be-displayed pictures, and the types and proportions of the fluorescent powder in the diffusion points are set according to the colors of the to-be-displayed pictures, so that the light loss can be reduced, and the energy-saving effect is ach