Water-saving method for producing bleached pulp liner cardboard paper

The invention relates to a water-saving method for producing bleached pulp liner cardboard paper, which sequentially comprises the following steps: 1, uniformly treating white water by a multi-disc fiber recycling machine; 2, leading out clear white water and carrying out decoloration treatment; 3, feeding the clear white water into a shallow air floatation treatment; 4, enabling the decolored clear white water to flow back to a surface pulp production line of the bleached pulp liner cardboard paper. The method disclosed by the invention has the advantages that in the step 2, the polyaluminum chloride liquid solution, the bentonite suspension, the flocculation decolorizing agent liquid solution and the anionic polyacrylamide diluent are sequentially added into the clear white water, so that the flocculation effect of fine fibers and colloidal substances in the clear white water can be effectively improved; secondly, under the action of shallow air floatation, the method realizes impurity separation in the cle