To realize a drying process of a hydrogel of a water-soluble polymer achieving a high drying efficiency and a short drying time by controlling the occurrence of caking.

The drying process of a hydrogel of a water-soluble polymer conducts the drying in two steps. The primary drying step uses continuous vibration dryer 51. The micronized water-soluble polymer hydrogel is placed on the drying deck, shook with a shaking stroke of ≥4 mm and blown with hot air from underneath of the drying deck. The secondary drying is made by using ventilation dryer 52.

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