The present invention relates to a mixed fertilizer which contains substances influencing nitrification of ammonium compounds or urea in soil. Provided is an environment-friendly slow-release sulfur-based nitrogen potassium compound fertilizer. The present invention is characterized by first preparing sulfur-based nitrogen potassium compound fertilizer granules, and then conducting primary coating of stearic acid and secondary surface powder spreading of modified zeolite powder on the sulfur-based nitrogen potassium compound fertilizer granules, to obtain the slow-release sulfur-based nitrogen potassium compound fertilizer, wherein the sulfur-based nitrogen potassium compound fertilizer granules are prepared from the following raw materials in parts by weight: 31 to 57 parts of urea, 10 to 20 parts of ammonium sulfate, 20 to 50 parts of potassium sulfate, 6 to 12 parts of a granulating auxiliary agent, and a proper amount of water. The present invention provides an environment-friendly slow-release sulfur-based nitrogen potassium compound fertilizer, which has good slow-release effect, high fertilizer effectiveness and utilization, simple process, and low production cost, is beneficial to protection of the soil, atmosphere, and water environment due to the fact that the coating material is easy to be degraded by microorganisms in soil, and is widely applied. The slow-release sulfur-based nitrogen potassium compound fertilizer is applicable to grain crops, vegetables, and fruit trees and used as a seed fertilizer, a base fertilizer, and a topdressing fertilizer. The compound fertilizer can also be mixed for use with all kinds of compound phosphate fertilizers available in the market.
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