This paper aims to satisfy the social needs of the elderly, increase the dialogue between the migrant elderly and the local elderly, as well as the communication between the elderly and other groups, improve the sense of security and identity of the migrant elderly in their current living environment, alleviate the loneliness of the migrant elderly arising from the urbanization process, and help the migrant elderly to better adapt to urban life. Based on the activity theory, with community elderly service as the entry point, explore the way to build community elderly service platforms through community collaboration intervention; with the help of questionnaire surveys, experiential observation, in-depth interviews and other methods, to explore the living conditions, social trends, and social places of the migrant elderly and the local elderly. Effectively integrate public services with community service resources of people, things, and the environment. By organizing activities, such as online shopping, dinner, parties, and get-togethers, etc., to build a hierarchical community service platform centered on the elderly, and construct a friendly social network among the migrant elderly. Using activity theory, integrating community resources, helping the migrant elderly to adapt to urban life, enriching the lives of the urban elderly in their twilight years, and give them a sense of identity and belonging, thus alleviating the problem of urban integration difficulties for the migrant elderly.