Rust protection method of stainless steel fastener

The invention relates to a rust protection method of a stainless steel fastener. The method comprises the following steps that the stainless steel fastener is heated to improve the surface reactivity;the surface of the stainless steel fastener is oxidized while being heated, and iron oxide is generated; acid is used for cleaning to remove partial iron oxide; and under the nitrogen atmosphere, thestainless steel fastener is subjected to temperature rise to 912 DEG C or above, the stainless steel fastener at the high-temperature state is cooled at the running time, and a nitride film is formedon the surface of stainless steel. The nitride layer has the rust protection effect, rust protection does not just rely on the nitric oxide layer, due to the fact that a corrosion-resisting protection layer with the higher chromium content is generated on the surface, even if due to friction, the nitric oxide layer is damaged, the rust protection can be continuously provided, in addition, throughtemperature rise and heat p