The invention discloses a stainless steel vacuum heat treatment technology. The technology comprises 1, selecting equipment, 2, according to stainless steel heat treatment, selecting a final vacuum degree of 13.3-1.33*10<-2>Pa so that equipment operation convenience and system safety and reliability are satisfied, wherein an equipment cost is increased along with final vacuum degree increasing, and 3, carrying out stainless steel vacuum heat treatment through (1), charging, (2), preheating, (3), heating at a heating temperature the same to a heating temperature in an air furnace and preferably at the lower limit temperature, (4), heat preservation, wherein in a stainless steel vacuum heat treatment process, heat preservation time in a high temperature zone is extended appropriately and is about 1 time longer than heating time in the air furnace and heat preservation time in a tempering low-temperature zone is longer than tempering heat preservation time in the air furnace, and (5), adjustment of a degree of vacuum in work. The treatment technology has simple processes and improves stainless steel performances.