The multifunctional light stabilizer were synthesized through joining the 2,4-dihydroxy-benzophenone (a ultraviolet absorber), triazine - stilbene fluorescent brighteners and the series of polyethylene glycol (PEG) in the same molecule with cyanuric chloride as the crosslinking monomer. The molecular structures were characterized by IR spectra and 1H NMR, the physical properties were examined by UV spectra and photoluminescence (PL) spectra, the application effect of the light stabilizer in paper sheet were tested. The results showed that the active ingredient of triazine - stilbene fluorescent brighteners (VBL)was 28.86 %, while the active ingredient of the multifunctional light stabilizer (FBs-400) was 61.8 % after illumination. The fluorescence was quenched when the concentration of the light stabilizer was over 1g / L, its usage can be enlarged than VBL (1×10-5 kg / L). The brightening effect and light stability of the multifunctional light stabilizer are nice in the performance of application. At the same time, its light stability are improved obviously.