Abstract: A high-intensity permanent magnetic separator for pre-concentration was designed and developed with the new-type extruded permanent magnet made of Nd-Fe-B. Then, the magnetic induction on the surface of belt conveyor came up to 1.0 T with the maximum magnetic gradient up to 68 mT/mm. Pre-concentration tests were done for the extra-lean hematite from Qidashan Iron Mine, including the size fractions -75 mm+50 mm, -50 mm+20 mm, -20 mm+5 mm, -5 mm+0 mm-roughing and scavenging each once. After the pre-concentration, the Fe ore grade was improved by 5.3%~6.8% if the original grade was 17%~18%, i.e., the recovery rate is higher than 60% and tailing grade around 13% with the yield of tailing higher than 50%.