To systematically investigate the durability performance of coal gangue pervious concrete (CGPC) under acid rain environment, various factors are taken into account, including designed porosity, acid rain pH value, and erosion time. These factors affect the mass, compressive strength, and permeability coefficient of CGPC. Moreover, the research delves into the erosion mechanism of acid rain. The results indicate that the compressive strength of CGPC shows an initial increase followed by a subsequent decrease under acid rain environment. The permeability coefficient slightly decreases in the early stage of acid rain erosion, followed by an increase in the later stage. In the acid rain, the reaction between \({\text{SO}}_{{4}}^{{2 - }}\) and Ca2+ generates expansive products such as gypsum. Initially, these products fill the pores, increasing the structural density. However, as erosion progresses, the continuous accumulation of gypsum leads to the formation of expansive microcracks, resulting in a reduction in strength.