The invention provides a UV-curing 
adhesive with low Tg point and high permeability and a preparation method thereof. The UV-curing 
adhesive is prepared from the following raw materials in parts by weight: 10-30 parts of a self-prepared 
urethane acrylate prepolymer with low Tg point, 30-60 parts of aliphatic 
polyurethane acrylate with low Tg point, 20-50 parts of a 
reactive diluent with low Tg point, 0.5-5 parts of a leveling 
wetting agent, 2-4 parts of a 
photoinitiator and 1-3 parts of a 
silane coupling agent; the self-prepared 
urethane acrylate prepolymer comprises long-chain glycol, diisocyanate, a catalyst, a 
polymerization inhibitor, an antioxygen and hydroxyl 
acrylate resin; the 
molar ratio of long-chain glycol, diisocyanate and acroleic hydroxyl ester is 1:(1.82.0):(1.8-2.0); the catalyst, the 
polymerization inhibitor and the antioxygen respectively account for 0.01-0.1wt% of the 
urethane acrylate prepolymer with low Tg point. Compared with the prior art, the UV-curing 
adhesive has the 
vitrification temperature less than or equal to 50 DEG C, and has the performances of low 
surface tension is low, good wettability, good surface 
dryness, excellent tenacity, excellent dampness and 
humidity resistance, high 
temperature resistance and the like.