Production process of compact spun yarn with stable hairiness index

The invention relates to the technical field of spinning, in particular to a production process of compact spun yarn with a stable hairiness index, spinning is conducted in a compact spinning mode, the specification of finished yarn is Nm30/2-Nm100/2, and the production process comprises the following steps that raw material pretreatment is conducted, specifically, wool raw materials are treated in a TEC treatment mode, and treated wool tops are obtained; pre-spinning: sequentially carrying out sliver mixing, combing, gilling and roving procedures on the treated wool tops to obtain roving slivers; spinning: drafting and twisting the roving slivers into semi-finished yarns according to a preset yarn count, and controlling the twist coefficient to be 82-84; spooling: setting a semi-finished yarn channel barrel, and cutting off harmful hairiness, foreign fibers and thick and thin threads; twisting by a two-for-one twister to form plied yarns to obtain finished yarns. The finished yarn produced by the invention h