The invention relates to an antibacterial heal-promoting gel material used for preparing medical wound dressing and a preparation method thereof. The antibacterial heal-promoting gel material used for preparing the medical wound dressing is characterized in that the antibacterial heal-promoting gel material comprises natural gel agents, chitosan, bioactive materials, soluble silver salt and organic acids, water is added into the ingredients, the water content accounts for 5 to 20 times of the weight sum of the natural gel agents and the chitosan, and then, the antibacterial heal-promoting gelmaterial of any forms can be obtained through cross-linked curing and aftertreatment. The antibacterial heal-promoting gel material is metered according to dry basis, and is prepared form the following ingredients in percentage by weight:57 to 90.9 percent of natural gel agents, 5 to 25 percent of bioactive materials, 2 to 8 percent of chitosan, 0.1 to 2 of soluble silver salt and 2 to 8 percent of organic acids. The antibacterial heal-promoting gel material has good biocompatibility, good antibiotic property, strong tissue regeneration promoting capacity and various forms, and can be easily and conveniently prepared into the medical wound dressing.