SmCo7-xFex(x=0, 0.4, 1, 2) amorphous powders prepared by high-energy milling were sintered into bulk nanocrystalline magnets using spark plasma sintering technique (SPS). XRD patterns show that the powder becomes amorphous after milled for 5 h; and the magnet exhibits stable TbCu7 structure after sintered by SPS. TEM observation indicates that the microstructure of the magnet is composed of SmCo7-xFex single phase grains with an average grain size of 20~50 nm. Magnetic measurement shows that the SmCo6.6Fe0.4 magnet has the magnetic properties as following: iHc=992.8 kA/m，Br=0.634 T, and (BH)max=69.75 kJ/m3.