Colorizing method of paper

The invention relates to the technical field of papermaking equipment and provides a colorizing method of paper. According to the colorizing method provided by the invention, colorizing can be realized by virtue of the colorizing method after the paper is made by using protoplasm, the paper is smooth, is uniform and bright in color and low in cost of dyes and is capable of freely regulating the color, enabling the dyes to circulate in a colorizing groove without leaking outsides by collection and utilization, so that severe pollution of a great deal of wastewater caused by directly adding the dyes in the protoplasm to make the paper in the original process is prevented. The colorizing method is capable of reducing sewage treatment and environmental protection investment costs and saving the energy, is low in cost, simple in operation, rapid in colorizing speed, high in yield, good in quality and small in occupied area, is environmentally friendly, energy-saving, economical and practical, is capable of synchronously completing colorizing during papermaking operation, is a novel blank colorizing method in the firecracker papermaking industry and can be applied to colorizing in the papermaking industry.