The present invention relates to: a hydrogel in which cross linking is formed at a proper temperature range using thermosensitive and cross-linkable phosphazene; and a preparation method and use thereof. The cross linking hydrogel according to the present invention enables cross linking to occur only when temperature reaches the proper temperature even though the cross linking hydrogel is irradiated with ultraviolet light to facilitate handling and injection as a solution state before injection. Moreover, the present invention relates to polyphosphazene-based hydrogel for a biomaterial, which does not need to be irradiated with the ultraviolet light directly to the skin after injection into a body, and also relates to the preparation method and the use thereof.;COPYRIGHT KIPO 2017
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