<p>Nano zero-valent iron/nickel (nZVI/Ni) was produced using liquid phase reduction method and characterized by SEM and XRD. In this study, the effect of dose of nZVI/Ni, pH value of acid rain, mixing method of nZVI/Ni by simulating rainfall leaching experiments in the soil column uniformly mixed with nZVI/Ni was studied. The concentration of Cr(VI), pH, conductivity and cumulative release of the leaching solution were measured. The convective dispersion equation model was successfully used to explain the transport behavior of nZVI/Ni in chromium contaminated soil mixed with nZVI/Ni. The speciation of Cr(VI) in the soil after leaching was determined by BCR continuous extraction method. The effect of nZVI/Ni application on the speciation of Cr(VI) in the soil was analyzed. Results showed that the best fixation efficiency was achieved when the nZVI/Ni dosage was 0.10% (w/w%) and pH of the simulated acid rain was 4.5. Pseudo-second-order kinetics characterizes the Cr elimination process better (R² &gt; 0.99), suggesting that nZVI/Ni predominantly extracts Cr (VI) from polluted soil under acid rain leaching through chemical adsorption/desorption mechanisms. The entire adsorption process included surface diffusion, mesopore diffusion and micropore diffusion. Acid extractable and reduced chromium decreased from 30 to 9%. Oxidizable and residual chromium increased from 70 to 91% in the remediated soil. Cr(VI) in the soil can be reduced Cr (VI) to Cr (III) by nZVI/Ni in the presence of acid rain. The concentrations of Cr leached from the soil by TCLP, SPLP, and SBET methods were 0.11, 0.034 and 0.028&#xa0;mg/L, which were lower than the standards. There are no obvious differences among the rapeseed stem, root lengths, seed germination rate and clean soil in the remediated soil. nZVI/Ni demonstrated superior treatment of real chromium polluted soil under acid rain. The theoretical foundation and scientific references for treating Cr (VI) polluted soil under acid rain is provided by this study.</p>