In recent years, with the rise of the domestic feminist movement and the rapid development of social networks, online women’s mutual assistance community came into being. All kinds of online women’s groups created on Douban platform are characterized by an open virtual community with a strong sense of identity, providing many suggestions and help for women. This paper focuses on Douban’s women group, analyzes its mutual assistance practice and discusses its impact on women’s mutual assistance and women’s development. And this paper holds that at the moment of rapid social development and change, women’s sense of identity and boundary in Douban group reflect the significance and value of women’s mutual assistance, which provides a new idea for the future feminist movement and the formulation of gender equality policy.