This paper undertakes a unique exploration, delving into the effects of reinforcement corrosion on the punching shear (PS) behavior of reinforced concrete (RC) slab-column connections. The study employs a nonlinear finite element (NLFE) model, a widely accepted method for analyzing complex structural behavior, to examine the influence of three key factors, including corrosion degree, concrete compressive strength, and column size, on the performance of corroded slab-column connections. The results obtained show that all three factors have an important influence on the load-bearing capacity of the structure. The findings, which have practical implications for the design and repair of RC structures, reveal that heightened corrosion significantly diminishes the load-carrying capacity of RC slab-column connections.