The invention relates to a production technique of a dissolved cotton pulp, in particular to a production technique that utilizes the raw material of cotton linters and adopts simple techniques to produce the dissolved cotton pulp with even fiber length, high fibrillation degree, good intensity, less water soluble substances, high methylcellulose content, stable polymerization degree and less dust, has low COD discharge in waste water, and lowers environmental pollution. The dissolved cotton pulp produced by the production technique is mainly used for producing paper that is used for wiping upper-scale precise instruments, steel paper that is used for precise machining, a novel medicine loading agent of microcrystalline cellulose, explosive nitrocellulose, high-level nitrolacquer and building coating materials, etc.