The invention relates to a method for preparing an oxygen carrier of chemical-looping hydrogen production by means of titanomagnetite, and belongs to the technical field of hydrogen energy preparation. The method comprises the steps that the titanomagnetite is ground to be titanomagnetite with the granularity smaller than 200 meshes; a hydrochloric acid solution is added to the obtained titanomagnetite for dipping, and slurry is obtained after ultrasound treatment is conducted; an aluminum nitrate solution is added to the slurry, a mixed liquid is obtained after ultrasound treatment is conducted, a NaOH solution is added to make pH of the mixed solution equal to 9.0, stirring is conducted continuously, and sedimentation is conducted for a night; solid-liquid separation is conducted on the solution which is subjected to blending modification and overnight sedimentation to obtain a solid substance, the solid substance is calcined for 2-5 h at the temperature ranging from 600 DEG C to 900 DEG C after being dried, and the titanomagnetite-based oxygen carrier is obtained. According to the method, cheap raw materials are utilized, the investment is less, the technology is simple, the activity of the obtained titanomagnetite-based oxygen carrier is high when the titanomagnetite-based oxygen carrier participates in chemical-looping hydrogen production, and the stability is strong.