Pulping method used for producing kraft paper from recycled waste paper

The invention discloses a pulping method used for producing kraft paper from recycled waste paper. The pulping method used for producing kraft paper from recycled waste paper comprises following steps: waste paper is selected, and is introduced into a cutting machine for cutting of waste paper into blocks, and a magnetic separation equipment is adopted for separation of magnetic materials in an obtained primary pulp; the primary pulp is introduced into a screening equipment to remove impurities in the primary pulp so as to obtain a fine screened pulp; the fine screened pulp is subjected to concentration using a multi-disc concentration machine so as to obtain a waste paper pulp; recycled leather is subjected to pulping using a pulper, and then is subjected to high concentration slag removing, coarse screening, low concentration slag removing, fine screening, and concentration successively so as to obtain a leather fiber slurry suitable for paper making; the waste paper pulp and the leather fiber slurry are in