The traditional UV-curable polyurethane resins were terminated with double bonds，with fewer polar groups，which reduced the adhesion of the coating on the surface ofwood. This paper adopted a two-step method to introduce a multi hydroxyl hyperbranchedstructure into polyurethane systems prepared with different isocyanates and block them， synthesizing a UV-curable polyurethane wood coating containing multi hydroxylhyperbranched structure. The properties of UV-curable polyurethane resin and wood coatingswere investigated by gel permeation chromatography（GPC）， nuclear magnetic resonance（NMR）， fourier infrared spectroscopy（FT-IR）， thermogravimetric analysis（TGA）， dynamic thermal mechanical analysis（DMA）. The results indicated that a polyhydroxy hyperbranched isocyanate with a molar ratio of —NCO to —OH of 1∶8 had been successfully prepared and introduced into polyurethane. Among them，the polyurethane with 1-isocyanato-4-［（ 4-isocyanatocyclohexyl）methyl］-cyclohexane as the main component had a tensile strength of 34. 69 MPa，an elastic modulus of 10. 64 MPa，a glass transition temperature of 102. 02 ℃， and a paint film adhesion of level 0. This method provided an innovative solution for UV-curable PU wood coatings with high strength and adhesion.