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Salt gland is one of the important epidermal structures of recreto-halophytes in resistance to salt stress, which secrete excessive salt ions out of the body to prevent the plant from being damaged by salt stress. As an important structure to achieve high salt resistance in halophytes, salt glands deserve extensive attention and discussion in the fields of stress physiology, development and evolutionary biology. A large number of studies have been reported in the ultrastructure, physiological function, mechanism of salt secretion and developmental pattern of salt glands. In this paper, we reviewed the research progress of salt gland structure, secretion mechanism and salt gland development, summarized the feasible pathways of salt gland secretion and the regulation mode and key genes of salt gland development, proposed relevant views for future research on salt gland secretion and development, and discussed the role of this unique morphological structure of salt gland on plant salt tolerance. We also proposed the theoretical basis and suggestions for improving plant salt tolerance and breeding salt-tolerant plant varieties. The related studies will be beneficial for in-depth analysis of plant salt tolerance adaptation evolution, cultivation of salt resistant crops, and efficient utilization of saline land. [ABSTRACT FROM AUTHOR]