Multi-layer variable combined diffusion plate

The invention discloses a multi-layer variable combined diffusion plate, belonging to the field of diffusion plates and having a multi-layer structure in which particle diffusion layers and transparent resin substrate layers are disposed alternately. The diffusion plate is mainly characterized in that: at least two particle diffusion layers are disposed in the multi-layer variable combined diffusion plate; and the two diffusion particle layers comprise substrates which are made from transparent materials, diffusion particles and ultraviolet absorbents uniformly. At least one outer surface of the diffusion plate disclosed by the invention is provided with a micro-structure, so that the luminous efficiency and the diffusion efficiency are improved.