Preparation method of high-transmittance high-haze light diffusion film

The invention relates to a preparation method of a high-transmittance high-haze light diffusion film, which comprises the steps of grinding two kinds of organic silicon light diffusion agents with the particle diameter being 1.0 micron and 2.5 microns to powder with the particle diameter being less than 0.1 micron, and performing fusing, blending and granulating on the two kinds to organic silicon diffusion agents and transparent polyester according to the a ratio of 1:1:2 in parts by mass so as to prepare a light diffusion master batch with the intrinsic viscosity being 0.60-0.75dL/g; uniformly mixing 5-25% of the prepared light diffusion master batch and 75%-95% of the transparent polyester according to a mass percentage in a high-speed dispersion machine so as to prepare a surface layer raw material; and sending 5-25% of the surface layer raw material and 75-95% of the transparent polyester to a corresponding extrusion system as core layer raw materials so as to perform fusion and extrusion, then casting i