The invention belongs to the technical field of fertilizers, and in particular relates to a
lignin slow-release water-soluble
fertilizer and a preparation method thereof. The
lignin slow-release water-soluble
fertilizer is prepared by adding a strong activating agent into an organic
straw liquid,
lignin, lignin-degrading
enzyme; when the lignin is
solid lignin, the weight parts of the organic
straw liquid, the
solid lignin and the lignin-degrading
enzyme are 60-90 parts of the organic
straw liquid, 10-40 parts of the
solid lignin and 1-3 parts of the lignin-degrading
enzyme; when the lignin is liquid lignin, the weight parts are 10-30 parts of the organic straw liquid, 70-100 parts of the liquid lignin and 1-3 parts of the lignin-degrading enzyme. The lignin slow-release water-soluble
fertilizer provided by the invention has a slow-release function and water-soluble fertilizer properties as well, environmental
pollution caused by comprehensive utilization of
biomass raw materials is reduced, problems that a conventional slow-release water-soluble fertilizer is high in production cost, incomplete in
nutrient component, relatively poor in
fertility and the like can be solved, and modern organic planting of integral water and fertilizers can be achieved.