A thin aqueous poultice prepared by laminating an adhesive layer on a support, wherein said support consists of a fiber film prepared by heat fusion of a soft plastic resin having a thickness of 3 to 35 μm selected from polyethylene methyl methacrylate and ethylene on a composite fiber that has a weight of 5 g to 50 g / m2 prepared by entangling a natural fiber selected from rayon and cotton, and a soft plastic fiber selected from polyethylene and polypropylene in a ratio of 1: 9 to 9: 1, or said support consists of a fiber film prepared by heat fusion of a plastic resin having a soft part and a hard part in common in a film that is 7 to 70 μm thick selected from polyamide elastomer and polyester elastomer on a fiber consisting of a plastic that has a soft part and a hard part in common that has a weight of 10 g to 80 g / m2 selected between polyamide elastomer and polyester elastomer, in which the adhesive layer consists of water, a moisture retention agent, poly (acrylic acid) and / or its salt, a cellulose derivative, a polyvalent metal salt hardly soluble and a pH control agent, and its pH is adjusted to 4 to 6, and in which the weight of the adhesive layer laminated on the support is 150 to 500 g / m2.Una cataplasma acuosa delgada preparada laminando una capa adhesiva sobre un soporte, en la que dicho soporte consiste en una película de fibra preparada mediante fusión por calor de una resina plástica blanda que tiene un espesor de 3 a 35 μm seleccionada de entre metilmetacrilato de polietileno y etileno sobre una fibra compuesta que tiene un peso de 5 g a 50 g/m2 preparada enredando una fibra natural seleccionada de entre rayón y algodón, y una fibra de plástico blando seleccionada de entre polietileno y polipropileno en una relación de 1:9 a 9:1, o dicho soporte consiste en una película de fibra preparada por fusión por calor de una resina plástica que tiene una parte blanda y una parte dura en común en una película que tiene de 7 a 70 μm de espesor selecciona
