In this experiment, the 3D printing technology of plasma powder was used to print the Stellite barrel type parts by robot 3D printing. After the experiment, the hardness and anatomy of the printed parts were analyzed. The experimental results show that the structure with dense structure and uniform macro hardness can be obtained by this method. After that, metallographic microscope, scanning electron microscope and high temperature hardness tester were used to test and analyze the samples. The results show that the microstructure of the samples is mainly dendrite, and there are obvious fusion zones between layers. The composition is uniform without obvious segregation. The high temperature hardness distribution accords with the change trend of high temperature hardness of stellite alloy, and the high hardness can be maintained at 700 ℃. The water erosion experiment shows that the printing part has better water corrosion resistance than the part obtained by conventional quenching process. The comprehensive experimental results show that the plasma printing technology of Stellite powder can form reliable components and has great potential for production.