Besides seawater and marine atmosphere, the service environment of marine equipment such as ships and amphibious aircraft also involves wave splashing. In this work, a corrosion platform in simulated splash zone is constructed, which consists of a simulated splash device and an electrochemical sensor. The localized corrosion of 5083 Al-alloy in simulated splash zone is investigated by using open circuit potential (OCP) measurement, electrochemical impedance spectroscope (EIS) combined with morphology analyses. Experimental results indicate that, compared with the corrosion in the full immersion zone, the alloy suffer severe pitting corrosion, intergranular corrosion and exfoliation corrosion, with a corrosion depth about 40~80 μm. The shape of the pits in the splash zone is closely related to the water flow direction. Under the joint action of the shear force of water flow and corrosion, lamellar exfoliation occurs at the bottom edge of the pit, resulting in a slow change in the depth of the pit with terraced inner walls. The high oxygen content and high seawater splash rate are the main cause of the high localized corrosion susceptibility in the splash zone. There are only scattered small pits of about 5 μm in depth, in the full immersion zone, and most of them originate from inclusions, whilst the inclusion serves as the cathode phase and the surrounding aluminum alloy matrix behaves as anode and is dissolved. EIS fitting results by using the Measurement Model show that the polarization resistance of the 5083 Al-alloy in the splash zone is 20%-50% of that in the full immersion zone, while the effective capacitance is about twice as large as that of the full immersion zone, indicating that the corrosion rate of the splash zone is higher than that of the full immersion zone. A larger effective capacitance in the splash zone corresponds to a coarser surface on which the corrosion products are accumulated.