Dimensionality-stable regenerated cellulose fiber and preparation method thereof

The invention relates to a preparation method of a dimensionality-stable regenerated cellulose fiber. The preparation method comprises the following steps: carrying out dipping, squeezing, crushing, ageing, yellowing, continuous dissolving, filtering, and deaeration operations on a cellulose raw material to prepare a spinning viscose glue; and spinning to prepare the dimensionality-stable regenerated cellulose fiber, wherein a mixture comprising one or more of a denaturant and a crosslinking agent is added in the continuous dissolving step of the spinning viscose glue operation or before the spinning step. The dimensionality, the dry strength, the wet strength and the dry extension of the dimensionality-stable regenerated cellulose fiber are 1.4-1.72dtex, 1.6-3.0CN/dtex, 1.2-2.8CN/dtex and 10-20% respectively. The dimensionality-stable regenerated cellulose fiber prepared by adopting the method of the invention overcomes disadvantages of low fabric preparation rate and bad dimensional stability caused by the