The invention belongs to the technical field of processing of stainless steel surfaces and particularly relates to a blackening treatment method for a stainless steel surface. The blackening treatment method for the stainless steel surface comprises the steps of polishing, electrolytic activation, normal-temperature coloring, film hardening, and hot-air drying. Compared with the prior art, the blackening treatment method for the stainless steel surface has the following advantages that through electrolytic activation, a coloring agent forms a layer of compact alloy oxide film on the stainless steel surface, and the problem of that the stainless steel surface is bluish when chemical coloring is adopted is effectively solved; the treatment method is simple and easy to control, a formed black stainless steel film is uniform and bright, obvious color differences are avoided, and both the abrasion resistance and the corrosion resistance are obviously improved; and cracks can be avoided when the variable cumulant of cold workability reaches 80% or over, and the blackening method is suitable for application and popularization.