Abstract:   Through the multiple normalizing process test of 12Cr2Ni4 carburized steel, the effect of multiple normalizing and ordinary normalizing effect were compared and analyzed, and the metallographic structure of the two processes was detected by metallographic method. When the normalizing temperature is heated and the holding time is exactly the same, the pearlite obtained after multiple normalizing is finer, the grain is refined, and the strength and hardness of the steel are higher.