The invention belongs to the technical field of ecological remediation, and discloses a method for remediating chromium polluted soil by enabling super fine iron powder to cooperate with microorganisms. The method comprises the following step of: sufficiently mixing the super fine iron powder and mixed bacteria with the chromium polluted soil to culture, thereby completing remediation of chromiumpolluted soil, wherein the mixed bacteria comprise chromium reducing bacteria, iron reducing bacteria and sulphate reducing bacteria. According to the method disclosed by the invention, the characteristic of corroding and releasing H2, in a remediation process, of the super fine iron powder is sufficiently utilized, and the microorganisms which take H2 as an electron donor are induced to grow andbreed on the surface, so that the microorganisms obtain energy, high-valence-state high-toxicity hexavalent chromium is reduced to be low-valence-state low-toxicity trivalent chromium, and the low-valence-state low-toxicity trivalent chromium is converted into occurrence forms, which are difficult in bioavailability, such as an iron-manganese combined form, an organic combined form and a residualform from a water-soluble form, an exchangeable form and a carbonate combined form, and therefore, transfer ability and bioavailability, in the soil, of chromium are reduced.