Dull type low-extensibility viscose fiber as well as preparation method and application thereof

The invention discloses a dull type low-extensibility viscose fiber as well as a preparation method and application thereof. The dull type low-extensibility viscose fiber is obtained by sequentially performing soaking, grinding, squeezing crushing, kneading, polymerization reduction, yellowing, dissolving, filtering, defoaming, curing, spinning drawing and after-treatment on a pulp raw material, and has the following technical indexes that the dry fracture strength is more than or equal to 3.10cN/dtex, the wet fracture strength is more than or equal to 1.70cN/dtex, the strength needed for generating 5% of the extensibility in a wet state is more than or equal to 0.55cN/dtex, and the dry fracture extensibility is 12.0-14.50%, the wet fracture extensibility is 16.0-21.0%, the radial water swelling capacity is 22-26%, and the delustering agent content is 0.8-5%. The viscose fiber disclosed by the invention is a novel viscose fiber, the production cost is lower than that of the existing Modal fiber, and the viscose fiber disclosed by the invention has good economic and social benefits, and is mainly applied to the field of production of jean fabrics.