In order to adapt to the stress of various environmental conditions such as high temperature, high salinity, hypoxia, and tidal flooding, mangrove plants have evolved a series of structural and physiological characteristics, and formed unique water use mechanisms and salt management strategies. This paper briefly describes the salt adaptability characteristics of mangrove plant Avicennia marina in morphological structure, physiology and ecology, including water transfer characteristics, water and salt management strategies, activation of antioxidant pathways, and focuses on the action mechanism of osmotic regulation on salt tolerance of Avicennia marina on the genetic and genomic level in recent years. The main characteristics of salt adaptation in mangroves are preliminarily revealed, which provides a new breakthrough point for further research on the molecular mechanism of mangroves adaptive evolution.