［Objective］To develop high-performance UV-curable coatings utilizing renewable resources，［Methods］soybean oil-based polyol（ESOR）was synthesized via the solvent-free ring-opening reaction of epoxidized soybean oil（ESO）with ricinoleic acid（RA）. A series of photoreactive epoxidized soybean oil-based polyurethane acrylate resins（ER-IH5，ER-IH7，and ER-IH9） were prepared by end-group modification of ESOR using the semi-addition product of isophoronediisocyanate and 2-hydroxyethyl acrylate. These resins served as the primary film-forming material toformulate UV-curable coatings. The effect of terminal double bond content on coating performance wassystematically investigated.［Results］As the results shown，with increasing double bond content in the photoreactive resins，the tensile strength，pencil hardness，gel content，and chemical resistance of the UV-cured coatings were significantly enhanced. And the ER-IH9 coating exhibited optimal performance：transmittance exceeding 95%，haze below 1%，tensile strength up to 26. 1 MPa，pencil hardness of 6H，adhesion grade of 0，gel content of 96. 5%，water absorption of only 0. 87%，and showed the lowest mass loss after immersion in acidic and alkaline media.［Conclusion］This UV-curable coating shows promising application in fields demanding high hardness and superior transparency.