The invention discloses a solid waste paper pulp and a manufacturing method thereof. The paper pulp comprises the following components (by weight percentage) of 10-70% of solid wastes and 30-90% of organic fiber when calculating by dry pulp, and comprises 5-15% of the solid waste modifier and 1-10% of adding treatment agent when calculating by the total weight of the solid wastes, wherein the solid content of the solid waste paper pulp is 40-80% and the content of the water is 20-60%; and the solid waste is wasted clothes and cloth. The manufacturing method comprises the following steps of firstly preparing raw materials by proportion, deslagging, cutting off and disintegrating the solid waste by a wet method, adding the solid waste modifier and the adding treatment agent in the solid waste, mixing the solid waste for 30-60 minutes under the pressure of 0.3-0.7MPa and at the temperature of 50-90 DEG C, thus obtaining the slurry dispersed uniformly; and mixing the slurry with the organic fiber slurry, grinding the slurry and dehydrating the slurry, thus obtaining the solid waste paper pulp. The solid waste paper pulp and the preparation method solve the treatment problem of the solid wastes, change wastes into precious article, save the consumption of log, reduce the cost of the paper pulp and protect the forests resources.