The utility model discloses a material die used for a filter pressing device. The material die comprises a filter plate, wherein the upper part of the filter plate is provided with a feeding channel connected with a feeding pipe, and the lower part of the filter plate is provided with a material die water discharging channel connected with a material die water discharging pipe; at least one of the two side faces of the filter plate is provided with a material die containing part, and a filter chamber is formed between the filter plate and an adjacent water die when the die is closed; the surface of the material die containing part is covered with material die filter cloth, and the middle part of the material die filter cloth is provided with a feeding hole; the feeding channel extends into the inner part of the filter plate and is communicated with the feeding hole; the surface of the material die containing part is uniformly provided with a plurality of material die water guide grooves at intervals; and the material die water discharging channel inwards extends from the edge of the filter plate and is communicated with the material die water guide grooves. According to the material die used for the filter pressing device, a supporting area on the filter cloth is greatly enlarged when the material die works, so that the filter pressing device can be used for carrying out filter pressing work under the action of higher pressure, and the service life of the filter cloth also can be prolonged; the damages on the filter cloth are reduced, and a good dehydration effect is obtained; and the material die is simple in structure and is easy to implement.