With the progress of science and technology and the growth of market demand, granulator is playing an increasingly important role in the plastics, chemical, pharmaceutical and other industries. Among the many types of granulator, the flat die granulator has become an effective tool to save the cost of organic fertilizer production line with its unique advantages. This paper will discuss in detail how to use the flat die granulatror to save the cost of the production line from the working principle, cost saving principle, simplicity of operation, improving production efficiency, maintenance and case analysis and outlook.Flat die granulator is a kind of organic fertilizer equipment using die head extrusion and flat mold granulation, which is mainly used for the production of granular products in plastics, chemical, pharmaceutical and other industries. The flat die granulator has the characteristics of simple structure, convenient operation and high production efficiency, which is suitable for the granulation of various raw materials and has a wide application prospect.In the process of using the flat die granulator, the cost of the production line can be reduced from the following aspects:1. High efficiency and energy saving: The flat die granulator adopts advanced die head extrusion technology, effectively reducing energy consumption, thereby reducing production costs.2. Reduce labor costs: The flat die granulator has a high degree of automation and easy operation, which can reduce labor costs on the production line.3. Improve the utilization rate of raw materials: the flat die granulator has strong adaptability to raw materials, high utilization rate, reduce raw material waste and reduce production costs.5. Reduce equipment maintenance costs: the flat die granulator has simple structure, low failure rate and low maintenance cost, which is conducive to reducing the operating cost of the production line.