The present invention relates to a visible light-curable chitosan derivative, a hydrogel, and a preparation method therefor and, more specifically, to a visible light-curable glycol chitosan derivative which is cured by light in the visible light range and has wound healing ability, a hydrogel, and a preparation method therefor. A hydrogel obtained by cross-linkage of the visible light-curable glycol chitosan derivative according to the present invention using visible light has a wound healing effect per se, and further, a hydrogel obtained by cross-linkage in a combination of one or more growth factors has an excellent wound healing effect. In addition, a glycol chitosan hydrogel that can prevent the denaturation of contained drugs and growth factors due to the cross-linkage by visible light and is optimized for application to a wet dressing dosage form can be prepared.
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