The invention discloses a combined ferrotitanium separator and an application method thereof and belongs to a mechanical engineering technology. The combined ferrotitanium separator comprises an upper rack, a lower base, a ferrotitanium sorting device arranged in the upper rack, a medium titanium sorting device and a careful selecting device, wherein the medium titanium sorting device and the careful selecting device are located in the lower base and are ranged side by side on the lower portion of the ferrotitanium sorting device, the ferrotitanium sorting device comprises a hopper, a first motor, a ferrotitanium segregator, a iron mine chute and a titanium middling chute, the medium titanium sorting device comprises a third motor, a medium titanium segregator, an iron chute and a middling tank, and the careful selecting device comprises a second motor, a titanium selecting device, a titanium ore tank, a middling tank and a tailing ore tank. According to the combined ferrotitanium separator and the application method thereof, the structure is simple, the occupied space is small, and the operation and maintenance are convenient, by means of the arrangement of the ferrotitanium sorting device, the medium titanium sorting device and the careful selecting device, ferrotitanium separation processes and titanium selecting processes are integrated to be completed in one machine, and the select quality of the titanium is improved, besides, the mineral utilization rate is improved, and thereby the economic benefits are improved.