Abstract: The core-shell CoFe₂O₄/TiO₂ magnetic nano-photocatalyst were prepared by hydrolysis of titanium tetrachloride precursor in the presence of the CoFe₂O₄ magnetic particles,and then be dried blew 100℃ and calcined at 350℃for 2h.The prepared photocatalysts were easy to be separated from treated water by using an external magnetic field and shown high catalytic activity for the degradation of methyl orange in water under UV and visible-light irradiation.The morphology and the crystalline structure of the CoFe₂O₄/TiO₂ were characterized by transmission electron microscopy（TEM）and X-ray diffraction（XRD）.The size of CoFe₂O₄ particles was about 20 nm.The diameter of CoFe₂O₄/TiO₂ particles is in the range of 30-40 nm.So the shell of TiO₂ enwraps closely around the core and the thickness is in the range of 10-20 nm.