The effects of sintering temperature (Tsps) on the magnetic properties and density of NdFeB magnets prepared by spark plasma sintering (SPS) from HDDR powders were studied. With increasing the sintering temperature in the range of 650-900 °C, the remanence (Br), intrinsic coercivity (Hcj) and maximum energy product ((BH)max) all increased first and then decreased. The optimum magnetic properties of Br = 0.78 T, Hcj = 577 kA/m and (BH)max = 78 kJ/m3 were obtained in the samples SPSed at 800 °C and the density reached 99% of the theoretical. The microstructure, XRD patterns and magnetic properties indicated that the sample (Tsps = 800 °C) was anisotropic to a certain degree. But the grain growth was obvious when the Tsps reached 900 °C. The SPSed magnet with optimal magnetic properties was subjected to hot deformation at 800 °C and an anisotropic magnet was obtained. The hot deformation made the Nd2Fe14B grain orient in such a way that the c-axis of the Nd2Fe14B grain was parallel to the pressing direction. However, the alignment of grains was disrupted by a small amount of abnormal large grains. The magnetic properties parallel to the c-axis of the SPSed + HDed magnet were as follows: Br = 1.09 T, Hcj = 384 kA/m, and (BH)max = 114 kJ/m3