The utility model discloses a filter-press plate of a chemical filter-press device. The filter-press plate comprises a primary filter-press filtering plate and a secondary filter-press filtering plate which are alternately arranged, wherein filter-press filtering cloth is sleeved on the primary filter-press filtering plate; a piece of filter-press filtering paper is also arranged between the filter-press filtering cloth and the adjacent secondary filter-press filtering plate; the primary filter-press filtering plate comprises a first fixed sealing border, a first feeding through hole, a first inner groove part, a first middle sealing bump, a conveying groove and a first discharge through hole; the secondary filter-press filtering plate comprises a second fixed sealing border, a second feeding through hole, a second inner groove part, a second middle sealing bump and a second discharge through hole; third feeding through holes which are used for communicating the first feeding through hole with the second feeding through hole are formed in the filter-press filtering cloth and the filter-press filtering paper; and third discharge through hole which are used for communicating the first discharge through hole with the second discharge through hole are also formed. According to the filter-press plate of the chemical filter-press device, the aperture level of the filter-press filtering cloth can be reduced; and the requirements of the filter-press device on pressure are reduced.