Wetlands are the most biodiversity-rich ecosystems in nature. The commonly used models for wetland ecological security evaluation include pressure-state-response (PSR) model, improved model and mutation level model, and the evaluation results of wetland ecological security can provide quantitative support for wetland conservation policy formulation. Taking the Qilihai Wetland, Tianjin, China, as the research object, the remote sensing classification of the Sentinel-2 data in 2016, 2019 and 2022 was carried out in this work to select indicators from natural attributes and human activities, then the wetland ecological security evaluation system was constructed based on PSR model, and the ecological structure and ecological functions of the wetland were analysed. The results show that the ecological security indices of the wetland in 2016, 2019 and 2022 were 0.532, 0.553 and 0.595, respectively. From 2016 to 2022, the overall ecological security situation in the wetland showed a good development trend, and the wetland area continued to increase. Specificly, the landscape connectivity of the wetland became better, the patch density became larger, the habitat quality showed an upward trend, the area of excellent habitat quality increased by 1.53%, and the quality of wildlife habitat gradually gradually improved. The obtained results can provide a positive reference for the improvement of wetland ecological security, the sustainable development and the formulation of relevant conservation measures of wetlands.