Coastal wetlands in the Yellow River Delta were studied to understand soil salinity changes. Soil samples were collected at different depths and locations during different seasons in 2015. The study found that soil salinity varied throughout the year, with higher levels in the landside and lower levels in the dune crest and seaward side. Salinity levels were influenced by factors like rain and soil texture. The ions Na+, Mg2+, Cl−, and SO42− were the main contributors to soil salinity, while Ca2+ had less impact. The study showed that soil salinity was highest in spring, followed by autumn and summer. Desalination was most effective in summer. Different areas of the wetlands showed varying degrees of salinization, with the landside and beach being more affected than the seaward side and dune crest.