The invention provides a 
collagen gel and a preparation method thereof. The 
collagen gel comprises collagen and an 
antibacterial agent, wherein the 
antibacterial agent is at least one of 
chitosan and nano silver. The 
collagen gel also comprises a 
preservative, a substrate, a dispersing agent, a film-forming agent and water; and 1g of gel comprises 0.5 to 8.0mg of collagen, 0.001 to 15mg of 
antibacterial agent, 1 to 50mg of 
preservative, 10 to 50mg of matrix, 50 to 100mg of dispersing agent, 1 to 10mg of film-forming agent, and the balance of water. The method for preparing the collagen gel comprises the following steps of: performing dispersion and 
dissolution on the substrate by adopting the dispersing agent under ten-thousand grade 
clean environment; adding the dispersing agent, the substrate, the 
preservative, the antibacterial agent, and collagen solution into a vacuum emulsified 
homogenizer one by one; after fully mixing, standing and defoaming, filling the product. The collagen gel is applied to various 
open wounds and infected wounds, lightens 
hyperpigmentation, has good effect of accelerating 
wound healing, and can maintain long-term anti-
bacteria function.