The invention belongs to the technical field of material machining and particularly discloses an LCD light guide plate. The LCD light guide plate comprises a light outlet surface and a back surface corresponding to the light outlet surface, wherein scattering lattice points are formed on the back surface, the cross-section shape of the scattering lattice points is a triangle, and the whole light outlet surface is a rough atomization surface. The invention further provides a manufacturing process of the LCD light guide plate. The LCD light guide plate is manufactured by virtue of a casting forming process. According to the LCD light guide plate and the manufacturing process, the problems of non-uniform thickness, yellowing and the like of light guide plates in the prior art can be solved.