Disclosed are a hydrogel dressing for covering or treating a wound and a method for preparing the same. The hydrogel dressing includes a matrix structure of a cross-linked mixture, and an elastic sheet coated with an elementary metal or ionic metal embodied in the matrix structure. The mixture comprises a hydrophilic polymer, about 0.5 to about 5 wt % of a photocatalyst agent and at least 80 wt % of water based on the total weight of the mixture.
