A method of manufacturing an absorbent sheet comprising an absorbent resin and hydrophilic fibers and hydrophobic fibers, dehydrated from the state of water and the hydrophilic fibers and the absorbent resin is in contact, the invention is a composite composition and to provide a manufacturing method of the absorbent sheet including a, a sheet forming step of forming the sheet by heating and dehydrating step of obtaining, while in contact with the hydrophobic fibers to the composite composition.本発明は、吸収性樹脂、親水性繊維及び疎水性繊維を含む吸収シートの製造方法であって、上記吸収性樹脂及び上記親水性繊維が接触し且つ含水した状態から脱水させ、複合組成物を得る脱水工程と、上記複合組成物を上記疎水性繊維と接触させた状態で加熱してシート状に成形するシート成形工程と、を備える吸収シートの製造方法を提供する。