The invention discloses a method for increasing the retention rate of slurry on a web portion. The method comprises the following steps: adding a dehydration accelerator into OCC slurry in a pulp poolfor mixing; before the slurry flows through a sieve-in front-of-a-web of the web portion, adding a polyacrylamide powder; after the slurry flows through the sieve-in front-of-a-web and enters the webportion, adding a polyacrylamide emulsion into the slurry. The slurry is dehydrated and formed through the web portion, pressed by a pressing portion, dried by a front drying portion, glued by a gluing machine, then dried by a rear drying portion, polished by a polishing machine, reeled, rewound, packaged and then stored into a warehouse. The dehydration accelerator is added into the pulp pool ofa paper machine, so that a polyacrylamide retention aid added before the slurry flows through the sieve-in front-of-a-web of a flowing portion of the paper machine and a polyacrylamide emulsion retention aid added after the slurry flows through the sieve-in front-of-a-web cooperate with the dehydration accelerator to improve the adsorption and flocculation conditions of tiny fibers and filler components in the slurry and improve the retention and dehydration properties of the slurry.