<p>This paper studied the seismic fragility analysis of corroded piles in marine environments under the coupled actions of chloride corrosion and earthquake. The combined models of the pitting and uniform corrosion are considered in the corrosion mechanism of the pile, and the influence of corrosion on the mechanical properties of pile materials ranging from 0 to 100 years is analyzed. According to the low-cycle reciprocating test, the hysteretic curves for different service times are obtained to express the stiffness attenuation of the pile subjected to chloride corrosion. The uncertainty of seismic waves is considered, and the curvature ductility coefficient is used as the damage index to calculate the impact of the earthquake on the marine corroded piles. Then, the vulnerability curves are presented. The results show that under the action of chloride ions corrosion, the reinforcement diameter, yield strength, ultimate strength, and concrete compressive strength of the pile decrease with increasing service time. Therefore, the bending capacity, stiffness, and seismic capacity of the pile decrease with the development of service time. From the seismic fragility curves and surfaces, it is observed that there is a nonlinear growth of failure probability for piles with the increase of peak seismic acceleration and service time under the coupled actions of chloride corrosion and earthquake.</p>