Fe3O4/TiO2 composites were prepared by heteroagglomeration. The composites of different Fe3O4 to TiO2 weight ratio were prepared by mixing of prepared Fe3O4 with TiO2 in aqueous slurry, under ultrasonic treatment. All prepared samples were characterized by XRD, VSM, SEM/EDS, raman spectroscopy and BET. The prepared composites contained TiO2 (anatase and rutile) and Fe3O4 crystal phases. The magnetization hysteresis loop for Fe3O4/TiO2 nanocomposites indicated that the hybrid catalyst showed superparamagnetic characteristics at room temperature. Photocatalytic performance of the prepared composites was examined by its ability to degrade methylene blue dye in aqueous solution. The photocatalytic activity of Fe3O4/TiO2 composites was lower than that of pure TiO2 sample because of the presence of non-active photocatalytic in composite (iron oxide). Under UV irradiation, the photocatalytic activity of Fe3O4/TiO2 (1:1) composite was relatively similar to Fe3O4/TiO2 (1:2), however, under sunlight irradiation, the photocatalytic activity of Fe3O4/TiO2 (1:2) composite was relatively increase. The Fe3O4/TiO2 composite can be easily recovered from treated water in slurry-type reactor by the application of an external magnetic field.