Aiming at the self characteristics of wool, wood and bamboo compound pulp, the invention provides a posttreatment process which is used for manufacturing viscose fibre pulp from compound pulp of cotton linter, wood pulp and bamboo pulp used as a raw material. The posttreatment process comprises the process steps of: chlorination, bleaching, washing and manufacturing. The cotton linter, the wood pulp and the bamboo pulp selected by the posttreatment process provided by the invention can be compounded according to any proportion; and the compound pulp has the following parameter indexes that methyl fibre is greater than or equal to 91%, the polymerization degree is less than or equal to 1200, the ash is less than or equal to 0.13%, the whiteness is greater than or equal to 91%, the viscosity is less than or equal to 13, and the iron matter is less than or equal to 30 ppm. The pulp inlet concentration of the treating process provided by the invention is 3%-5%, the pulp is subjected to acid treatment in a pre-acid pool to adjust the pH value to 1-3 at room temperature, the pulp is then fed into a chlorination tower, and the bleaching temperature is 30-65 DEG C. The whole technological process is simple in equipment and operation, convenient for use, high in production efficiency and stable in product quality.