This drum granulator overcomes the limitations of traditional equipment by eliminating "single-material restrictions" and "high nutrient loss." Designed as a multi-adaptive, gentle nutrient-retaining solution, it serves organic fertilizer, bio-fertilizer, and specialty fertilizer production needs. Unlike conventional drum granulators that use high-speed extrusion or high-temperature processing, this model employs low-speed gentle tumbling—materials bond into granules through natural rolling and precise moisture control, preserving heat-sensitive nutrients and beneficial microorganisms in bio-fertilizers.