The invention relates to a hydrogel wound dressing and a preparation process thereof. The finished product of the hydrogel wound dressing is prepared by using gel, a cross-linking agent, a chelating agent, pH regulator, a thickening agent, humectant and a bacteriostatic agent as raw materials, and conducting pH regulation, mixing, secondary pH regulation, drying and other processes. The hydrogel wound dressing and the preparation process have the advantages that cross-linking and curing are conducted on the basis of traditional hydrogel to form the hydrogel wound dressing, and the preparation method is simple and convenient to operate; the prepared hydrogel wound dressing overcomes the defect that water absorption of a hydrogel dressing is insufficient, the mechanical strength of hydrogel is improved, and practicability and the experience feeling are enhanced; the prepared hydrogel wound dressing can provide a wet heal environment and can also absorb a large amount of seepage; a macromolecule hydrophilic material is adopted for hydrogel, no fiber is left when the dressing is replaced, the dressing does not adhere to wound surfaces, pain is relieved, and meanwhile hydrogel is good in biocompatibility and free of toxic and side effects.