The black porcelain far-infrared radiation plate, which is made of vanadium slag, has a wide range of sintering temperature, extrusive coloring role and excellent ceramic performance. The content of transition metal oxide in the fouth cycle is more than 80%. The radiation rate was up to 0.95, and after 2 000 hours of 650 ℃ accelerated aging test, the radiation rate does not change, and the surface layer does not fall off. By SEM analysis on fracture morphology and microstructure, the blank plate was composed of ilmenite, board-ilmenite and anemousite, and the particles were mechanically mixed, and black porcelain plate was composed of grain, vitreous body and pore, and most metal oxide in raw material were enriched in the grain, and the formation of cordierite and spodumene, zircon and other minerals were surrounded by vitreous body, which has excellent chemical stability. Non-toxic, harmless, non-radioactive, was a kind of far-infrared radiant of low cost, long life, high efficiency.