In order to solve the problems of high agglomeration of titanium dioxide, uneven dispersion in viscose, and high defects of finished fibers in the production of high-clean viscose staple fibers by the pre-spinning injection method, a new type of high-cleanness viscose staple fiber was developed. The titanium dioxide with a content of 0.5%-1% of alphacellulose and a dispersant with a content of 0.003% of alphacellulose were prepared into a matting agent solution with a concentration of 200-260 g/L. After stirring for 1 hour, the matting agent solution was poured into the dissolving machine in step 21.1 of sulphofication technical process. The solution of viscose and matting agent was ground and stirred for 80 minutes and 16 cycles in the dissolving machine and fine homogenizer, so that the titanium dioxide particles were fully and uniformly dispersed into the viscose. The results show that the whiteness of the new high-clean viscose staple fiber was 94%-95%, and the defect was less than 1.0 mg/kg.