Preparation method and application of nanocomposite of silver, chitosan and/or derivative thereof

The invention discloses a nanocomposite of silver, chitosan and/or a chitosan derivative and a preparation method thereof. The preparation method comprises the steps of evenly mixing the chitosan and/or the chitosan derivative fine powder with silver nitrate fine powder and fully grinding for 1-3 hours with the weight proportion of the chitosan and/or the chitosan derivative to the silver nitrate of 100: 0.0005-0.5; adding a reducing agent with the reduction equivalence ratio of the reducing agent to the silver nitrate of 1: 1-2: 1 and fully grinding for 2-6 hours, thereby obtaining the nanocomposite of the silver, chitosan and/or the chitosan derivative with the silver particle size of 1-100nm. The nanocomposite has the effects of promoting wound healing, stopping bleeding, alleviating pain, anti-inflammation and sterilization, can be used for treating female vaginitis, cervicitis, cervical erosion, bedsores, skin ulcers, burns, scalds, trauma and other skin inflammation, tinea manus and pedis and the like, and can also be used for preparing a variety of trauma dressings, such as thin films, sponges, gynecological suppositories, patches and the like.