The working principle of the dry granulator was introduced, and the hydraulic system and the control system were designed. The pressure fluctuation amplitude of the hydraulic system was reduced by adopting the variable frequency speed regulation and the subsection control strategy for the oil pump motor. The parallelism of the two rollers was ensured by adding the post-pressure cylinder and PID closed-loop control of the roller displacement. The 485 field bus and the USS protocol were used to realize the PLC start-stop control and the information acquisition of multiple frequency converters. The touch screen interface with the recipe storage and the audit tracking function was designed. The practical production shows that the equipment has stable performance, good operation, high performance cost ratio and broad market prospects.