Abstract: In order to realize the utilization of industrial solid waste resources and the development of green building materials, this study used steel slag aggregate (SSA) to replace natural aggregates to prepare steel slag geopolymer permeable concrete. By designing five kinds of steel slag aggregate replacement rates, the influence on the dry weight, pore characteristics and mechanical properties of the material was systematically explored. XRD and TG-DTG technologies were used to analyze the microscopic product characteristics of the interface transition zone. The results show that the SSA substitution rate has a significant linear positive correlation with the dry weight of concrete. As the SSA substitution rate increases, the porosity, sand permeability coefficient, and water permeability coefficient increase simultaneously. The indicators of the full substitution group are respectively improved by 21.96%, 18.77%, and 37.63% compared with the baseline group. The incorporation of SSA significantly strengthens the mechanical properties, and the 7- and 28-day compressive strengths of SSGPC100 are increased by 17.7% and 28.2% respectively.