The invention discloses a meat waste material fermented fertilizer and a preparation method thereof. The meat waste material fermented fertilizer is prepared from, by weight, 4 wt%-6 wt% of HCl solution, zinc oxide powder, fish heads, fish viscera, chicken viscera, seafood waste materials, biogas digester silt, a compound enzyme preparation, chicken manure, ferrous sulfate, urea, rice straw powder, potassium permanganate, boric acid, cellulose homogenate and water. A lot of meat waste materials exist in life and are difficult to treat and prone to breed bacteria, pests, viruses and the like, and environmental hygiene is seriously affected; the biogas digester silt which is rich in various fermentation bacteria is utilized for serving as composting powder of meat fermentation materials and matched with the enzyme preparation, waste compositions can be decomposed into humic acids and a small amount of amino acids to be used for adsorbing inorganic elements, the function of promoting inorganic mineral absorption is achieved, soil humus is increased, and the soil texture is improved.