The present invention relates to a UV-curable hydrogel resin for transdermal administration, a hydrogel prepared using the UV-curable hydrogel resin, and a cataplasm prepared using the UV-curable hydrogel resin. More particularly, the present invention relates to a hydrogel resin with an optimal composition and composition ratio which allows increase in a water content of a hydrogel applied as a drug layer of a cataplasm, skin irritation mitigation, and crosslinking degree adjustment for adhesion control and is capable of controlling drug releasing property and transdermal absorbability, a hydrogel prepared by UV-hardening the hydrogel resin, and a cataplasm including the hydrogel.
