A Cu-Sn-Fe-Ni alloy was prepared by melt casting and thermomechanical treatment The static corrosion behavior in NaCl solution was characterized by scanning electron microscope and X-ray photoelectron spectroscopy. Finally, the corrosion mechanism of the alloy was discussed and analyzed. The results show that the static corrosion rate of the alloy in 3.5 wt.% NaCl solution is 0.0473 mm/a, and the corrosion resistance is good; The corrosion resistance of the alloy increases first and then decreases with the increase of immersion time; The alloy has an obvious preferential corrosion tendency in the immersion process. At first, Fe removal corrosion occurs, and then Cu oxidizes to form a relatively dense passivation film, which reduces the corrosion rate of the alloy. Later, Sn and Ni begin to dissolve and corrosion, forming an oxide film, which makes the passivation film denser. However, at the time, Fe removal corrosion still occurs in the lower layer of the passivation film, which promotes the local destruction of the dense passivation film, leading to the decline of the corrosion resistance of the alloy.