[Problem] To provide a water-absorbent treatment material which can be manufactured at low cost without resulting in quality degradation, and a manufacturing method thereof. [Solution] This water-absorbent treatment material (1) contains a water absorbent material which comprises plastic and/or fluff pulp obtained by separating a water absorbent polymer from hygiene products containing plastic, fluff pulp and a water absorbent polymer. The weight ratio of the water absorbent polymer that adheres to the water absorbent material to said water-absorbent treatment material is 3% or less.