In order to improve the hydrophilic and antistatic properties of polyacrylonitrile (PAN) fibers, tin-antimony oxide-coated titanium dioxide (TiO2@ATO) and sodium dodecylbenzene sulfonate (SDBS) were used to modify PAN fibers, and TiO2@ATO/SDBS-PAN composite fibers were prepared by using homemade wet spinning equipment. The effect of the mass fraction of TiO2@ATO/SDBS on the composite fibers was investigated by fixing m(TiO2@ATO)∶m(SDBS)=4∶1. The micro-morphology, structural composition, thermal stability and whiteness of the TiO2@ATO/SDBS-PAN composite fibers were characterized and determined using SEM, XRD, FTIR, TGA, and whiteness meter by fiber The hydrophilic and antistatic properties of TiO2@ATO/SDBS-PAN composite fibers were tested by water absorption multiplicity determination experiments and electrical resistance tester, and the water washing resistance of fiber resistivity was tested by water washing experiments. The results showed that TiO2@ATO and SDBS were uniformly distributed in TiO2@ATO/SDBS-PAN composite fibers when the mass fraction of TiO2@ATO/SDBS was 25%; TiO2@ATO/SDBS-PAN composite fibers were able to conduct charges rapidly and effectively, and compared with the samples without the addition of SDBS, their volume resistivity was reduced from 1013 Ω·cm to 108 Ω·cm, with better antistatic properties and less effect on the whiteness of the composite fiber, as well as good resistance to water washing; The water absorption ratio of TiO2@ATO/SDBS-PAN composite fibers was increased from 98.1% of that of pure PAN fibers to 117.8%, showing good hydrophilicity.