Soil enzymes in coastal wetlands play a crucial role in plant community development. The activities of key enzymes like sucrase, phosphatase, catalase, and urease were studied in different plant communities in the Yellow River Delta. Results showed higher enzyme activities in the rhizosphere (root zone) soils compared to non-rhizosphere soils. Different plant communities influenced enzyme activities differently. Sucrase activity was highest in Tamarix chinensis, while urease activity was highest in Phragmites australis. Soil properties like nutrient levels and water content were closely linked to enzyme activities. Overall, factors like total carbon, organic matter, and soil moisture had the biggest impact on soil enzyme activity in these coastal wetlands.