Drum granulator is one of the key equipment in the compound fertilizer industry, suitable for cold and hot granulation and large-scale production of high, medium and low concentration compound fertilizers. The main working method is granulation wet granulation. Through quantitative water or steam, the basic fertilizer is fully chemically reacted after the humidity is adjusted in the cylinder. The pressure clumped into a ball. The barrel of the machine is lined with a special rubber plate or an acid-resistant stainless steel liner, which realizes automatic scar removal and tumor removal, and cancels the traditional scraper device. There is no three wastes discharged during the production process of the machine, and it has the characteristics of high ball forming strength, good appearance quality, corrosion resistance, wear resistance, low energy consumption, long service life, and convenient operation and maintenance.