The invention discloses a light and thin optical film module. The optical film module comprises a polarization type brightening film, a brightening film and a diffusion plate which are stacked from top to bottom in sequence, wherein sealing adhesive tapes further adhere to the peripheral side edges of the optical film module and contacted with the side edge of the polarization type brightening film, the side edge of the brightening film and the side edge of the diffusion plate respectively. The optical film module has the advantages that the probability of scratching is low, water vapor is not likely to enter the optical film module, the mass is lighter, the preparation efficiency is higher and the like.