The invention belongs to the technical field of pressure-sensitive adhesives, and particularly relates to a UV curing pressure-sensitive adhesive and a preparation method thereof. The UV curing pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 40-70 parts of butyl acrylate, 20-60 parts of hydroxyethyl acrylate, 3-5 parts of crylic acid, 10-30 parts of 1,6-hexanediol diacrylate, 1-5 parts of 4-acryloylmorpholine, 8-20 parts of isocyanatoethyl methacrylate, an initiator accounting for 0.6%-1.2% of the total quality score of the components and a photoinitiator accounting for 0.8%-1.5% of the total quality score of the components; and azodiisobutyronitrile or tert-amyl peroxyvalerate is used as the initiator, the relative molecular mass of a triggeredand polymerized acrylate polymer is less, molecular weight distribution is wide, and viscosity of a glue solution is moderate. Prepared pressure-sensitive tape can meet the requirements of environmental protection, energy saving and high efficiency in the production of tape in the field of electronic industry, meanwhile, high adhesion requirements are achieved, the preparation method is simple inprocess, operation and control are convenient, the quality is stable, the production efficiency is high, the production cost is low, and large-scale industrial production can be achieved.