Paper pulp purification method for producing regenerated paper pulp by using waste paper

The invention discloses a paper pulp purification method for producing regenerated paper pulp by using waste paper. The method comprises the steps of repulpling, performing high-concentration residueremoval, performing coarse screening, performing low-concentration residue removal, performing fine screening, performing low-temperature deinking purification, and performing flotation and purification, wherein deinking purification enzyme is added, so that most of printing ink, lightweight sticking substances and light plastic in the waste paper raw pulp can be separated; due to via hole shear treatment and adoption of the deinking purification enzyme in a low-temperature deinking tank, various impurities in the waste paper pulp can be completely eliminated, the deinking treatment can be conducted under the environment that the temperature is 60 to 70 DEG C instead of the high-temperature environment being 220 DEG C or higher; energy conservation and environmental friendliness are achieved; various deinking prep