Pervious paving is an essential element of sponge city construction. However, regular previous cement concrete only has a minimal filtering effect on surface runoff, and the preparation process produces significant amounts of carbon dioxide. Slag-based geopolymer pervious concrete has great mechanical qualities, being energy efficient and eco-friendly. Red mud is an alkaline residue released during the alumina refining process from bauxite mining, and there is no known way to treat it. This paper investigates the effects of red mud content, aggregate gradation, and alkali exciter content on the performance of red mud slag-based geopolymer pervious concrete (RMSGPC) through orthogonal experiments. It is discovered that the right red mud content can not only promote colloidal reaction but also remove heavy metal ions. Multi-graded aggregates can provide a better performance, and alkali exciter mainly has the greatest effect on mechanical properties.