Preparation process of spun rayon yarn

The invention relates to the field of spinning, and particularly discloses a preparation process of spun rayon yarn. The preparation process comprises the following steps of S1, performing cleaning; S2, performing pretreatment: heating a short fiber raw material to 90-120 DEG C, adding water accounting for 2-6% of the mass of the short fiber raw material, preserving heat for 10-30 minutes to obtain pretreated short fibers, and continuously preserving heat; S3, performing antibacterial treatment: adding an antibacterial solution into the pretreated short fibers, performing heat-preservation soaking for 30-60 minutes, and performing drying to obtain antibacterial short fibers; and S4, performing spinning, wherein the antibacterial solution is prepared from the following components in parts by weight of 100 parts of water and 1-4 parts of an antibacterial component, the antibacterial component is composed of an organosilicon quaternary ammonium salt antibacterial agent and an antibacterial agent A in a mass part