Abstract: In order to explore the regulatory effect of steel slag aggregate (SSA) on the decontamination performance of geopolymer permeable concrete, SSA was used to replace natural aggregate (NA) to prepare steel slag geopolymer permeable concrete. Five SSA substitution rates were designed. The evolution of its nitrogen and phosphorus removal performance was analyzed through a static immersion test system. The denitrification adsorption mechanism was revealed by combining pseudo-first-order kinetics, pseudo-second-order kinetics and the Elovich model. The results show that the SSA substitution rate has a differential impact on the decontamination performance of the material. The denitrification performance decreases significantly with the increase of the SSA substitution rate. The kinetic fitting shows that the Elovich model has the best fit to the denitrification data. This study provides theoretical support and technical reference for optimizing the decontamination performance of steel slag-based ecological permeable concrete and promoting the research and development of ecological building materials.