The invention discloses a magnetic hard rock fine iron removing and sorting system which is composed of a feeding system, a hard rock screening system, a whole hard rock sorting system, a hard rock coarse sorting system, a hard rock fine sorting system and an automatic hard rock returning system. The hard rock screening system can conduct size grading on hard rocks. Materials containing whole balls and crushed balls are subjected to whole ball iron removal and sorting. The hard rock coarse sorting system can sort out all ferrous metal. The hard rock fine sorting system can accurately separate the sorted metallic iron from the hard rocks. The whole sorting system adopts the low-energy-consumption energy saving technology. The separation technology adopts a PLC-controlled pneumatic push rod, the precision of an actuating mechanism is high, and the iron piece separation precision is high. By the adoption of the whole sorting system, the effects that a produced tailing discharging system operates continuously, and all the hard rocks and iron return to a production system after sorting can be guaranteed, and the environment-friendly zero-emission standard is met. The magnetic hard rock fine iron removing and sorting system is high in automation degree, compact in structure, small in occupied area and convenient to install.