Abstract: To investigate the seismic behavior of squat reinforced concrete (RC) shear walls corroded in the environment of acid rain, five corroded squat RC shear wall specimens were made subjected to accelerated corrosion in a simulated acidic environment, and quasi-static tests were carried out. The seismic behavior of RC shear walls was investigated under different design parameters and the same degree of acid rain corrosion. Experimental results shows the loss of concrete strength, corrosion of steel bars, rust expansion, cracking and shedding of protective layers of the shear wall due to the combined erosion of H⁺、\rmSO_4^2- 、\rmNO_3^- and other corrosive ions in the simulated acid solution. As the axial compression ratio increases, the cracking load, yielding load, and peak load of the wall increase, the crack development slows down, but the damage occurs more suddenly. Reducing the spacing of the transversely distributed reinforcements can restrain the concrete web of the shear wall, limit the development of cracks and improve the ductility of specimens, but the improvement in bearing capacity is slight. On the basis of experimental study, a prediction formula for shear strength of RC shear wall against acid rain corrosion is proposed using the strut-and-tie model, and its accuracy is verified. The proposed model can provide theoretical support for life-cycle seismic performance evaluation of RC shear walls under an acid rain erosion environment.