In the production line of NPK compound fertilizer, the Fertilizer Granules Compaction Machine is one of the key equipment, and its maintenance cost is an important part of the operation cost of the production line. These costs usually cover necessary work such as regular inspections, cleaning, replacement of worn parts and lubrication. The maintenance cost is not only affected by the characteristics of the equipment itself, but also closely related to the frequency of use of the NPK Fertilizer Production Line, the severity of the operating environment, the meticulousness of the maintenance plan and the market price of spare parts.