In view of the simple drying method of small granular (powder) materials, low heat utilization rate and ineffective guarantee of the quality of dry products, a pilot-scale radio frequency dryer for small granular (powder) materials was designed by using radio frequency heating technology. The device consistd of a heating system and a conveying system. The heating system mainly comprised an RF generator and a finned heating tube. The main conveying part of the conveying system was a conveyor belt. At the same time, in order to ensure the uniformity of RF drying, a material thickness limiting device was also designed. The corn granules were used as test materials to analyze the material balance and energy consumption of the designed RF dryer. The results show that the drying of 1 000 kg corn granules took an average of 40.83 min and the average drying energy consumption was 4 241.438 9 kJ/kg·H₂O. The machine could greatly improve the heat energy utilization rate, and the dry product quality could be guaranteed. (Including powder) materials RF drying industrial application provides theoretical basis and technical support.