The invention discloses stable type stainless steel feed for injection molding and a preparation method of the stable type stainless steel feed, and belongs to the technical field of stainless steel injection molding. The stable type stainless steel feed for the injection molding is prepared by the following components of, by weight, 88-93 parts of stainless steel powder, 5-9 parts of kemata, 0.1-1 part of hardening agent, 0.1-0.6 part of compatibilizer, 0.1-0.4 part of lubricant, 0.1-0.3 part of dispersing agent, 0.1-0.2 part of toughening agent and 0.1-0.5 part of stabilizer, and the stabletype stainless steel feed is formed by adding the components to banburying equipment in different orders and blending. The stainless steel feed has excellent liquidity and stability, the number of recycling of the stainless steel feed in the injection molding is increased, a degraded material through multiple times of recycling still has stable liquidity, after the stainless steel feed is injectedinto a green body and is sintered, a product has the characteristics like stable performance and sintered density, the waste of raw materials in use is reduced, and the cost of an MIM piece can be lowered and the yield of an MIM product can be increased substantially.